21654706561992 has 96 divisors (see below), whose sum is σ = 67105051366080. Its totient is φ = 6179805601920.

The previous prime is 21654706561987. The next prime is 21654706561997. The reversal of 21654706561992 is 29916560745612.

21654706561992 is a `hidden beast` number, since 2 + 1 + 6 + 5 + 4 + 7 + 0 + 6 + 5 + 619 + 9 + 2 = 666.

It is an interprime number because it is at equal distance from previous prime (21654706561987) and next prime (21654706561997).

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (21654706561997) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 24755134 + ... + 25614957.

It is an arithmetic number, because the mean of its divisors is an integer number (699010951730).

Almost surely, 2^{21654706561992} is an apocalyptic number.

It is an amenable number.

21654706561992 is an abundant number, since it is smaller than the sum of its proper divisors (45450344804088).

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

21654706561992 is a wasteful number, since it uses less digits than its factorization.

21654706561992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50370963 (or 50370956 counting only the distinct ones).

The product of its (nonzero) digits is 48988800, while the sum is 63.

The spelling of 21654706561992 in words is "twenty-one trillion, six hundred fifty-four billion, seven hundred six million, five hundred sixty-one thousand, nine hundred ninety-two".