21151122 has 16 divisors (see below), whose sum is σ = 44141760. Its totient is φ = 6743792.

The previous prime is 21151069. The next prime is 21151147. The reversal of 21151122 is 22115112.

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, 76497 + ... + 76772.

It is an arithmetic number, because the mean of its divisors is an integer number (2758860).

Almost surely, 2^21151122 is an apocalyptic number.

21151122 is an abundant number, since it is smaller than the sum of its proper divisors (22990638).

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

21151122 is a wasteful number, since it uses less digits than its factorization.

21151122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153297.

The product of its digits is 40, while the sum is 15.

The square root of 21151122 is about 4599.0348987587. The cubic root of 21151122 is about 276.5526366746.

Adding to 21151122 its reverse (22115112), we get a palindrome (43266234).

The spelling of 21151122 in words is "twenty-one million, one hundred fifty-one thousand, one hundred twenty-two".