1021221010 has 16 divisors (see below), whose sum is σ = 1846913472. Its totient is φ = 406551600.

The previous prime is 1021220969. The next prime is 1021221041. The reversal of 1021221010 is 101221201.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 239886 + ... + 244105.

It is an arithmetic number, because the mean of its divisors is an integer number (115432092).

Almost surely, 2^1021221010 is an apocalyptic number.

1021221010 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1021221010 is a deficient number, since it is larger than the sum of its proper divisors (825692462).

1021221010 is a wasteful number, since it uses less digits than its factorization.

1021221010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 484209.

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 1021221010 is about 31956.5487811184. The cubic root of 1021221010 is about 1007.0242148813.

Adding to 1021221010 its reverse (101221201), we get a palindrome (1122442211).

The spelling of 1021221010 in words is "one billion, twenty-one million, two hundred twenty-one thousand, ten".