21400452510 has 64 divisors (see below), whose sum is σ = 51787088640. Its totient is φ = 5659545600.

The previous prime is 21400452509. The next prime is 21400452529. The reversal of 21400452510 is 1525400412.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4805785 + ... + 4810235.

It is an arithmetic number, because the mean of its divisors is an integer number (809173260).

Almost surely, 2^21400452510 is an apocalyptic number.

21400452510 is an abundant number, since it is smaller than the sum of its proper divisors (30386636130).

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

21400452510 is a wasteful number, since it uses less digits than its factorization.

21400452510 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5753.

The product of its (nonzero) digits is 1600, while the sum is 24.

Adding to 21400452510 its reverse (1525400412), we get a palindrome (22925852922).

The spelling of 21400452510 in words is "twenty-one billion, four hundred million, four hundred fifty-two thousand, five hundred ten".