210550756221 has 12 divisors (see below), whose sum is σ = 327523398748. Its totient is φ = 129569696064.

The previous prime is 210550756153. The next prime is 210550756243. The reversal of 210550756221 is 122657055012.

210550756221 is a `hidden beast` number, since 2 + 10 + 550 + 75 + 6 + 2 + 21 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 11644568100 + 198906188121 = 107910^2 + 445989^2 .

It is not a de Polignac number, because 210550756221 - 2⁷ = 210550756093 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210550756321) 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, 899789440 + ... + 899789673.

Almost surely, 2^210550756221 is an apocalyptic number.

It is an amenable number.

210550756221 is a deficient number, since it is larger than the sum of its proper divisors (116972642527).

210550756221 is a wasteful number, since it uses less digits than its factorization.

210550756221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1799579132 (or 1799579129 counting only the distinct ones).

The product of its (nonzero) digits is 42000, while the sum is 36.

The spelling of 210550756221 in words is "two hundred ten billion, five hundred fifty million, seven hundred fifty-six thousand, two hundred twenty-one".