210121001121 has 16 divisors (see below), whose sum is σ = 294980696640. Its totient is φ = 132674688000.

The previous prime is 210121001107. The next prime is 210121001161. The reversal of 210121001121 is 121100121012.

It is not a de Polignac number, because 210121001121 - 2¹⁷ = 210120870049 is a prime.

It is a super-2 number, since 2×210121001121² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 210121001097 and 210121001106.

It is not an unprimeable number, because it can be changed into a prime (210121001161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 232620 + ... + 688733.

It is an arithmetic number, because the mean of its divisors is an integer number (18436293540).

Almost surely, 2^210121001121 is an apocalyptic number.

It is an amenable number.

210121001121 is a deficient number, since it is larger than the sum of its proper divisors (84859695519).

210121001121 is a wasteful number, since it uses less digits than its factorization.

210121001121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 925376.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 210121001121 its reverse (121100121012), we get a palindrome (331221122133).

The spelling of 210121001121 in words is "two hundred ten billion, one hundred twenty-one million, one thousand, one hundred twenty-one".