210121099975 has 12 divisors (see below), whose sum is σ = 260556818584. Its totient is φ = 168092586720.

The previous prime is 210121099973. The next prime is 210121099999. The reversal of 210121099975 is 579990121012.

It is not a de Polignac number, because 210121099975 - 2¹ = 210121099973 is a prime.

It is a hoax number, since the sum of its digits (46) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210121099973) 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, 1206352 + ... + 1369498.

Almost surely, 2^210121099975 is an apocalyptic number.

210121099975 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

210121099975 is a deficient number, since it is larger than the sum of its proper divisors (50435718609).

210121099975 is a wasteful number, since it uses less digits than its factorization.

210121099975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214674 (or 214669 counting only the distinct ones).

The product of its (nonzero) digits is 102060, while the sum is 46.

The spelling of 210121099975 in words is "two hundred ten billion, one hundred twenty-one million, ninety-nine thousand, nine hundred seventy-five".