21163134512220 has 48 divisors (see below), whose sum is σ = 61833158231040. Its totient is φ = 5398132860736.

The previous prime is 21163134512209. The next prime is 21163134512251. The reversal of 21163134512220 is 2221543136112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7667800980 + ... + 7667803739.

It is an arithmetic number, because the mean of its divisors is an integer number (1288190796480).

Almost surely, 2^{21163134512220} is an apocalyptic number.

21163134512220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21163134512220 is an abundant number, since it is smaller than the sum of its proper divisors (40670023718820).

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

21163134512220 is a wasteful number, since it uses less digits than its factorization.

21163134512220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15335604754 (or 15335604752 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 33.

Adding to 21163134512220 its reverse (2221543136112), we get a palindrome (23384677648332).

The spelling of 21163134512220 in words is "twenty-one trillion, one hundred sixty-three billion, one hundred thirty-four million, five hundred twelve thousand, two hundred twenty".