21250253435064 has 32 divisors (see below), whose sum is σ = 53149318801920. Its totient is φ = 7080259783136.

The previous prime is 21250253435063. The next prime is 21250253435101. The reversal of 21250253435064 is 46053435205212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21250253435063) 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, 197321832 + ... + 197429495.

It is an arithmetic number, because the mean of its divisors is an integer number (1660916212560).

Almost surely, 2^{21250253435064} is an apocalyptic number.

21250253435064 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21250253435064 is an abundant number, since it is smaller than the sum of its proper divisors (31899065366856).

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

21250253435064 is a wasteful number, since it uses less digits than its factorization.

21250253435064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 394753579 (or 394753575 counting only the distinct ones).

The product of its (nonzero) digits is 864000, while the sum is 42.

The spelling of 21250253435064 in words is "twenty-one trillion, two hundred fifty billion, two hundred fifty-three million, four hundred thirty-five thousand, sixty-four".