21146531302660 has 48 divisors (see below), whose sum is σ = 44799625261440. Its totient is φ = 8384208249600.

The previous prime is 21146531302651. The next prime is 21146531302667. The reversal of 21146531302660 is 6620313564112.

It is a super-2 number, since 2×21146531302660² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21146531302667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6280870 + ... + 9041149.

It is an arithmetic number, because the mean of its divisors is an integer number (933325526280).

Almost surely, 2^{21146531302660} is an apocalyptic number.

21146531302660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21146531302660 is an abundant number, since it is smaller than the sum of its proper divisors (23653093958780).

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

21146531302660 is a wasteful number, since it uses less digits than its factorization.

21146531302660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15322636 (or 15322634 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 40.

Adding to 21146531302660 its reverse (6620313564112), we get a palindrome (27766844866772).

The spelling of 21146531302660 in words is "twenty-one trillion, one hundred forty-six billion, five hundred thirty-one million, three hundred two thousand, six hundred sixty".