21155164356050 has 192 divisors, whose sum is σ = 42338123520000. Its totient is φ = 7840545465600.

The previous prime is 21155164356047. The next prime is 21155164356061. The reversal of 21155164356050 is 5065346155112.

It is a super-2 number, since 2×21155164356050² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21155164355992 and 21155164356010.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 8877533159 + ... + 8877535541.

It is an arithmetic number, because the mean of its divisors is an integer number (220511060000).

Almost surely, 2^{21155164356050} is an apocalyptic number.

21155164356050 is an abundant number, since it is smaller than the sum of its proper divisors (21182959163950).

21155164356050 is a wasteful number, since it uses less digits than its factorization.

21155164356050 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3281 (or 3276 counting only the distinct ones).

The product of its (nonzero) digits is 540000, while the sum is 44.

The spelling of 21155164356050 in words is "twenty-one trillion, one hundred fifty-five billion, one hundred sixty-four million, three hundred fifty-six thousand, fifty".