21500121330612 has 18 divisors (see below), whose sum is σ = 54347528919138. Its totient is φ = 7166707110192.

The previous prime is 21500121330593. The next prime is 21500121330671. The reversal of 21500121330612 is 21603312100512.

21500121330612 is a `hidden beast` number, since 2 + 1 + 5 + 0 + 0 + 1 + 2 + 13 + 30 + 612 = 666.

It can be written as a sum of positive squares in only one way, i.e., 15646170114576 + 5853951216036 = 3955524^2 + 2419494^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 298612796223 + ... + 298612796294.

Almost surely, 2^{21500121330612} is an apocalyptic number.

It is an amenable number.

21500121330612 is an abundant number, since it is smaller than the sum of its proper divisors (32847407588526).

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

21500121330612 is a wasteful number, since it uses less digits than its factorization.

21500121330612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 597225592527 (or 597225592522 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The spelling of 21500121330612 in words is "twenty-one trillion, five hundred billion, one hundred twenty-one million, three hundred thirty thousand, six hundred twelve".