21061641502 has 8 divisors (see below), whose sum is σ = 34464504312. Its totient is φ = 9573473400.

The previous prime is 21061641449. The next prime is 21061641509. The reversal of 21061641502 is 20514616012.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21061641509) 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, 478673649 + ... + 478673692.

It is an arithmetic number, because the mean of its divisors is an integer number (4308063039).

Almost surely, 2^21061641502 is an apocalyptic number.

21061641502 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21061641502 is a deficient number, since it is larger than the sum of its proper divisors (13402862810).

21061641502 is a wasteful number, since it uses less digits than its factorization.

21061641502 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 957347354.

The product of its (nonzero) digits is 2880, while the sum is 28.

The spelling of 21061641502 in words is "twenty-one billion, sixty-one million, six hundred forty-one thousand, five hundred two".