21660602512054 has 8 divisors (see below), whose sum is σ = 35444622292488. Its totient is φ = 9845728414560.

The previous prime is 21660602512039. The next prime is 21660602512057. The reversal of 21660602512054 is 45021520606612.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 21660602511998 and 21660602512016.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21660602512057) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 492286420707 + ... + 492286420750.

It is an arithmetic number, because the mean of its divisors is an integer number (4430577786561).

Almost surely, 2^{21660602512054} is an apocalyptic number.

21660602512054 is a deficient number, since it is larger than the sum of its proper divisors (13784019780434).

21660602512054 is a wasteful number, since it uses less digits than its factorization.

21660602512054 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 984572841470.

The product of its (nonzero) digits is 172800, while the sum is 40.

The spelling of 21660602512054 in words is "twenty-one trillion, six hundred sixty billion, six hundred two million, five hundred twelve thousand, fifty-four".