1011221406 has 96 divisors (see below), whose sum is σ = 2405108160. Its totient is φ = 305206272.

The previous prime is 1011221389. The next prime is 1011221413. The reversal of 1011221406 is 6041221101.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4415700 + ... + 4415928.

It is an arithmetic number, because the mean of its divisors is an integer number (25053210).

Almost surely, 2^1011221406 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1011221406, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1202554080).

1011221406 is an abundant number, since it is smaller than the sum of its proper divisors (1393886754).

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

1011221406 is a wasteful number, since it uses less digits than its factorization.

1011221406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 530 (or 527 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

The square root of 1011221406 is about 31799.7076401655. The cubic root of 1011221406 is about 1003.7265641358.

Adding to 1011221406 its reverse (6041221101), we get a palindrome (7052442507).

The spelling of 1011221406 in words is "one billion, eleven million, two hundred twenty-one thousand, four hundred six".