20210121102210 has 32 divisors (see below), whose sum is σ = 52235389926720. Its totient is φ = 4974799040448.

The previous prime is 20210121102181. The next prime is 20210121102239. The reversal of 20210121102210 is 1220112101202.

It is an interprime number because it is at equal distance from previous prime (20210121102181) and next prime (20210121102239).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 20210121102210.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25910411280 + ... + 25910412059.

It is an arithmetic number, because the mean of its divisors is an integer number (1632355935210).

Almost surely, 2^{20210121102210} is an apocalyptic number.

20210121102210 is an abundant number, since it is smaller than the sum of its proper divisors (32025268824510).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20210121102210 is a wasteful number, since it uses less digits than its factorization.

20210121102210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51820823362.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 20210121102210 its reverse (1220112101202), we get a palindrome (21430233203412).

The spelling of 20210121102210 in words is "twenty trillion, two hundred ten billion, one hundred twenty-one million, one hundred two thousand, two hundred ten".