21146004492 has 24 divisors (see below), whose sum is σ = 49389606000. Its totient is φ = 7041678336.

The previous prime is 21146004491. The next prime is 21146004493. The reversal of 21146004492 is 29440064112.

It is an interprime number because it is at equal distance from previous prime (21146004491) and next prime (21146004493).

It is not an unprimeable number, because it can be changed into a prime (21146004491) 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, 861117 + ... + 885332.

It is an arithmetic number, because the mean of its divisors is an integer number (2057900250).

Almost surely, 2^21146004492 is an apocalyptic number.

It is an amenable number.

21146004492 is an abundant number, since it is smaller than the sum of its proper divisors (28243601508).

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

21146004492 is a wasteful number, since it uses less digits than its factorization.

21146004492 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1747465 (or 1747463 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 33.

The spelling of 21146004492 in words is "twenty-one billion, one hundred forty-six million, four thousand, four hundred ninety-two".