21035451504 has 40 divisors (see below), whose sum is σ = 56704263552. Its totient is φ = 6706955200.

The previous prime is 21035451499. The next prime is 21035451509. The reversal of 21035451504 is 40515453012.

It is an interprime number because it is at equal distance from previous prime (21035451499) and next prime (21035451509).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21035451509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9525822 + ... + 9528029.

Almost surely, 2^21035451504 is an apocalyptic number.

21035451504 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21035451504 is an abundant number, since it is smaller than the sum of its proper divisors (35668812048).

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

21035451504 is a wasteful number, since it uses less digits than its factorization.

21035451504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19053885 (or 19053879 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 30.

The spelling of 21035451504 in words is "twenty-one billion, thirty-five million, four hundred fifty-one thousand, five hundred four".