21157285982950 has 96 divisors (see below), whose sum is σ = 43182836121600. Its totient is φ = 7663896414720.

The previous prime is 21157285982933. The next prime is 21157285982969. The reversal of 21157285982950 is 5928958275112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 705486556 + ... + 705516544.

It is an arithmetic number, because the mean of its divisors is an integer number (449821209600).

Almost surely, 2^{21157285982950} is an apocalyptic number.

21157285982950 is an abundant number, since it is smaller than the sum of its proper divisors (22025550138650).

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

21157285982950 is a wasteful number, since it uses less digits than its factorization.

21157285982950 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50546 (or 50541 counting only the distinct ones).

The product of its (nonzero) digits is 36288000, while the sum is 64.

The spelling of 21157285982950 in words is "twenty-one trillion, one hundred fifty-seven billion, two hundred eighty-five million, nine hundred eighty-two thousand, nine hundred fifty".