1011221010 has 80 divisors (see below), whose sum is σ = 2812887000. Its totient is φ = 260354304.

The previous prime is 1011220997. The next prime is 1011221011. The reversal of 1011221010 is 101221101.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 965779929 + 45441081 = 31077^2 + 6741^2 .

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 1011220983 and 1011221001.

It is not an unprimeable number, because it can be changed into a prime (1011221011) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1966 + ... + 45014.

Almost surely, 2^1011221010 is an apocalyptic number.

1011221010 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1011221010, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1406443500).

1011221010 is an abundant number, since it is smaller than the sum of its proper divisors (1801665990).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1011221010 is a wasteful number, since it uses less digits than its factorization.

1011221010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43097 (or 43088 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

The square root of 1011221010 is about 31799.7014136926. The cubic root of 1011221010 is about 1003.7264331141.

Adding to 1011221010 its reverse (101221101), we get a palindrome (1112442111).

Subtracting from 1011221010 its reverse (101221101), we obtain a palindrome (909999909).

The spelling of 1011221010 in words is "one billion, eleven million, two hundred twenty-one thousand, ten".