21357441550 has 48 divisors (see below), whose sum is σ = 41666708160. Its totient is φ = 8135199360.

The previous prime is 21357441509. The next prime is 21357441571. The reversal of 21357441550 is 5514475312.

It is a super-2 number, since 2×21357441550² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (37).

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, 35865 + ... + 209764.

It is an arithmetic number, because the mean of its divisors is an integer number (868056420).

Almost surely, 2^21357441550 is an apocalyptic number.

21357441550 is a deficient number, since it is larger than the sum of its proper divisors (20309266610).

21357441550 is a wasteful number, since it uses less digits than its factorization.

21357441550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 245725 (or 245720 counting only the distinct ones).

The product of its (nonzero) digits is 84000, while the sum is 37.

The spelling of 21357441550 in words is "twenty-one billion, three hundred fifty-seven million, four hundred forty-one thousand, five hundred fifty".