21525380402000 has 80 divisors (see below), whose sum is σ = 54787757793600. Its totient is φ = 8156986243200.

The previous prime is 21525380401999. The next prime is 21525380402069. The reversal of 21525380402000 is 20408352512.

It is a tau number, because it is divible by the number of its divisors (80).

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, 283190690 + ... + 283266689.

It is an arithmetic number, because the mean of its divisors is an integer number (684846972420).

Almost surely, 2^{21525380402000} is an apocalyptic number.

21525380402000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21525380402000 is an abundant number, since it is smaller than the sum of its proper divisors (33262377391600).

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

21525380402000 is a wasteful number, since it uses less digits than its factorization.

21525380402000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 566457421 (or 566457405 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 32.

Adding to 21525380402000 its reverse (20408352512), we get a palindrome (21545788754512).

The spelling of 21525380402000 in words is "twenty-one trillion, five hundred twenty-five billion, three hundred eighty million, four hundred two thousand".