21121492 has 24 divisors (see below), whose sum is σ = 42505344. Its totient is φ = 8995872.

The previous prime is 21121453. The next prime is 21121493. The reversal of 21121492 is 29412112.

21121492 is nontrivially palindromic in base 3.

It is a super-2 number, since 2×21121492² = 892234848612128, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21121493) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2418 + ... + 6934.

It is an arithmetic number, because the mean of its divisors is an integer number (1771056).

Almost surely, 2^21121492 is an apocalyptic number.

It is an amenable number.

21121492 is an abundant number, since it is smaller than the sum of its proper divisors (21383852).

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

21121492 is a wasteful number, since it uses less digits than its factorization.

21121492 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4695 (or 4693 counting only the distinct ones).

The product of its digits is 288, while the sum is 22.

The square root of 21121492 is about 4595.8124417778. The cubic root of 21121492 is about 276.4234381074.

The spelling of 21121492 in words is "twenty-one million, one hundred twenty-one thousand, four hundred ninety-two".