21501871350 has 48 divisors (see below), whose sum is σ = 53496218880. Its totient is φ = 5715383200.

The previous prime is 21501871253. The next prime is 21501871423. The reversal of 21501871350 is 5317810512.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 183810 + ... + 277109.

It is an arithmetic number, because the mean of its divisors is an integer number (1114504560).

Almost surely, 2^21501871350 is an apocalyptic number.

21501871350 is an abundant number, since it is smaller than the sum of its proper divisors (31994347530).

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

21501871350 is a wasteful number, since it uses less digits than its factorization.

21501871350 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 461245 (or 461240 counting only the distinct ones).

The product of its (nonzero) digits is 8400, while the sum is 33.

The spelling of 21501871350 in words is "twenty-one billion, five hundred one million, eight hundred seventy-one thousand, three hundred fifty".