21043269624 has 32 divisors (see below), whose sum is σ = 56654957520. Its totient is φ = 6474852096.

The previous prime is 21043269593. The next prime is 21043269673. The reversal of 21043269624 is 42696234012.

It is a super-2 number, since 2×21043269624² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

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, 33722877 + ... + 33723500.

Almost surely, 2^21043269624 is an apocalyptic number.

21043269624 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21043269624 is an abundant number, since it is smaller than the sum of its proper divisors (35611687896).

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

21043269624 is a wasteful number, since it uses less digits than its factorization.

21043269624 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67446399 (or 67446395 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 39.

The spelling of 21043269624 in words is "twenty-one billion, forty-three million, two hundred sixty-nine thousand, six hundred twenty-four".