21533430771660 has 48 divisors (see below), whose sum is σ = 60328119108096. Its totient is φ = 5738961258432.

The previous prime is 21533430771563. The next prime is 21533430771667. The reversal of 21533430771660 is 6617703433512.

It is not an unprimeable number, because it can be changed into a prime (21533430771667) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 102611412 + ... + 102821051.

It is an arithmetic number, because the mean of its divisors is an integer number (1256835814752).

Almost surely, 2^{21533430771660} is an apocalyptic number.

21533430771660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21533430771660 is an abundant number, since it is smaller than the sum of its proper divisors (38794688336436).

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

21533430771660 is a wasteful number, since it uses less digits than its factorization.

21533430771660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 205434222 (or 205434220 counting only the distinct ones).

The product of its (nonzero) digits is 1905120, while the sum is 48.

The spelling of 21533430771660 in words is "twenty-one trillion, five hundred thirty-three billion, four hundred thirty million, seven hundred seventy-one thousand, six hundred sixty".