21157110550212 has 48 divisors (see below), whose sum is σ = 60758881583232. Its totient is φ = 5579897287680.

The previous prime is 21157110550211. The next prime is 21157110550249. The reversal of 21157110550212 is 21205501175112.

It is not an unprimeable number, because it can be changed into a prime (21157110550211) 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, 9687320589 + ... + 9687322772.

It is an arithmetic number, because the mean of its divisors is an integer number (1265810032984).

Almost surely, 2^{21157110550212} is an apocalyptic number.

It is an amenable number.

21157110550212 is an abundant number, since it is smaller than the sum of its proper divisors (39601771033020).

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

21157110550212 is a wasteful number, since it uses less digits than its factorization.

21157110550212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19374643388 (or 19374643386 counting only the distinct ones).

The product of its (nonzero) digits is 7000, while the sum is 33.

The spelling of 21157110550212 in words is "twenty-one trillion, one hundred fifty-seven billion, one hundred ten million, five hundred fifty thousand, two hundred twelve".