21125045320000 has 70 divisors (see below), whose sum is σ = 52383246853058. Its totient is φ = 8450018112000.

The previous prime is 21125045319997. The next prime is 21125045320031. The reversal of 21125045320000 is 2354052112.

It can be written as a sum of positive squares in 5 ways, for example, as 11098652383296 + 10026392936704 = 3331464^2 + 3166448^2 .

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

It is a congruent number.

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, 264023067 + ... + 264103066.

Almost surely, 2^{21125045320000} is an apocalyptic number.

21125045320000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21125045320000 is an abundant number, since it is smaller than the sum of its proper divisors (31258201533058).

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

21125045320000 is an frugal number, since it uses more digits than its factorization.

21125045320000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 528126165 (or 528126140 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 25.

Adding to 21125045320000 its reverse (2354052112), we get a palindrome (21127399372112).

The spelling of 21125045320000 in words is "twenty-one trillion, one hundred twenty-five billion, forty-five million, three hundred twenty thousand".