21525214120000 has 70 divisors (see below), whose sum is σ = 53375535422198. Its totient is φ = 8610085632000.

The previous prime is 21525214119901. The next prime is 21525214120037. The reversal of 21525214120000 is 2141252512.

It can be written as a sum of positive squares in 5 ways, for example, as 4820729619456 + 16704484500544 = 2195616^2 + 4087112^2 .

It is a Harshad number since it is a multiple of its sum of digits (25).

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 269025177 + ... + 269105176.

Almost surely, 2^{21525214120000} is an apocalyptic number.

21525214120000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21525214120000 is an abundant number, since it is smaller than the sum of its proper divisors (31850321302198).

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

21525214120000 is an frugal number, since it uses more digits than its factorization.

21525214120000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 538130385 (or 538130360 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 25.

Adding to 21525214120000 its reverse (2141252512), we get a palindrome (21527355372512).

The spelling of 21525214120000 in words is "twenty-one trillion, five hundred twenty-five billion, two hundred fourteen million, one hundred twenty thousand".