21201097912950 has 24 divisors (see below), whose sum is σ = 52578722824488. Its totient is φ = 5653626110080.

The previous prime is 21201097912949. The next prime is 21201097912961. The reversal of 21201097912950 is 5921979010212.

It is a self number, because there is not a number n which added to its sum of digits gives 21201097912950.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 70670326227 + ... + 70670326526.

It is an arithmetic number, because the mean of its divisors is an integer number (2190780117687).

Almost surely, 2^{21201097912950} is an apocalyptic number.

21201097912950 is an abundant number, since it is smaller than the sum of its proper divisors (31377624911538).

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

21201097912950 is a wasteful number, since it uses less digits than its factorization.

21201097912950 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141340652768 (or 141340652763 counting only the distinct ones).

The product of its (nonzero) digits is 204120, while the sum is 48.

The spelling of 21201097912950 in words is "twenty-one trillion, two hundred one billion, ninety-seven million, nine hundred twelve thousand, nine hundred fifty".