210121220111010 has 64 divisors (see below), whose sum is σ = 571665829633920. Its totient is φ = 48999928250880.

The previous prime is 210121220110979. The next prime is 210121220111027. The reversal of 210121220111010 is 10111022121012.

It is a happy number.

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

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 14178212571 + ... + 14178227390.

It is an arithmetic number, because the mean of its divisors is an integer number (8932278588030).

Almost surely, 2^{210121220111010} is an apocalyptic number.

210121220111010 is an abundant number, since it is smaller than the sum of its proper divisors (361544609522910).

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

210121220111010 is a wasteful number, since it uses less digits than its factorization.

210121220111010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28356440003.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 210121220111010 its reverse (10111022121012), we get a palindrome (220232242232022).

The spelling of 210121220111010 in words is "two hundred ten trillion, one hundred twenty-one billion, two hundred twenty million, one hundred eleven thousand, ten".