21012402750 has 32 divisors (see below), whose sum is σ = 52446959136. Its totient is φ = 5603307200.

The previous prime is 21012402743. The next prime is 21012402787. The reversal of 21012402750 is 5720421012.

It is a self number, because there is not a number n which added to its sum of digits gives 21012402750.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14007519 + ... + 14009018.

It is an arithmetic number, because the mean of its divisors is an integer number (1638967473).

Almost surely, 2^21012402750 is an apocalyptic number.

21012402750 is an abundant number, since it is smaller than the sum of its proper divisors (31434556386).

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

21012402750 is a wasteful number, since it uses less digits than its factorization.

21012402750 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28016557 (or 28016547 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 24.

Adding to 21012402750 its reverse (5720421012), we get a palindrome (26732823762).

The spelling of 21012402750 in words is "twenty-one billion, twelve million, four hundred two thousand, seven hundred fifty".