121201211010210 has 128 divisors (see below), whose sum is σ = 307109480832000. Its totient is φ = 30577997076480.

The previous prime is 121201211010167. The next prime is 121201211010211. The reversal of 121201211010210 is 12010112102121.

It is a happy number.

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 121201211010210.

It is not an unprimeable number, because it can be changed into a prime (121201211010211) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3315885 + ... + 15918464.

It is an arithmetic number, because the mean of its divisors is an integer number (2399292819000).

Almost surely, 2^{121201211010210} is an apocalyptic number.

121201211010210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121201211010210 is an abundant number, since it is smaller than the sum of its proper divisors (185908269821790).

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

121201211010210 is a wasteful number, since it uses less digits than its factorization.

121201211010210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19234556.

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

Adding to 121201211010210 its reverse (12010112102121), we get a palindrome (133211323112331).

The spelling of 121201211010210 in words is "one hundred twenty-one trillion, two hundred one billion, two hundred eleven million, ten thousand, two hundred ten".