210121013213001 has 18 divisors (see below), whose sum is σ = 333608110052490. Its totient is φ = 127346068613280.

The previous prime is 210121013212997. The next prime is 210121013213009. The reversal of 210121013213001 is 100312310121012.

210121013213001 is a `hidden beast` number, since 2 + 101 + 210 + 1 + 321 + 30 + 0 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 206252710973001 + 3868302240000 = 14361501^2 + 1966800^2 .

It is not a de Polignac number, because 210121013213001 - 2² = 210121013212997 is a prime.

It is not an unprimeable number, because it can be changed into a prime (210121013213009) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 96474293316 + ... + 96474295493.

It is an arithmetic number, because the mean of its divisors is an integer number (18533783891805).

Almost surely, 2^{210121013213001} is an apocalyptic number.

It is an amenable number.

210121013213001 is a deficient number, since it is larger than the sum of its proper divisors (123487096839489).

210121013213001 is a wasteful number, since it uses less digits than its factorization.

210121013213001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192948588837 (or 192948588823 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

Adding to 210121013213001 its reverse (100312310121012), we get a palindrome (310433323334013).

The spelling of 210121013213001 in words is "two hundred ten trillion, one hundred twenty-one billion, thirteen million, two hundred thirteen thousand, one".