21021600550 has 24 divisors (see below), whose sum is σ = 39125660976. Its totient is φ = 8403159840.

The previous prime is 21021600547. The next prime is 21021600553. The reversal of 21021600550 is 5500612012.

It is an interprime number because it is at equal distance from previous prime (21021600547) and next prime (21021600553).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21021600553) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 59089 + ... + 213388.

It is an arithmetic number, because the mean of its divisors is an integer number (1630235874).

Almost surely, 2^21021600550 is an apocalyptic number.

21021600550 is a deficient number, since it is larger than the sum of its proper divisors (18104060426).

21021600550 is a wasteful number, since it uses less digits than its factorization.

21021600550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 274032 (or 274027 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 22.

The spelling of 21021600550 in words is "twenty-one billion, twenty-one million, six hundred thousand, five hundred fifty".