121201221210 has 16 divisors (see below), whose sum is σ = 290882930976. Its totient is φ = 32320325648.

The previous prime is 121201221157. The next prime is 121201221221. The reversal of 121201221210 is 12122102121.

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 121201221210.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2020020324 + ... + 2020020383.

It is an arithmetic number, because the mean of its divisors is an integer number (18180183186).

Almost surely, 2^121201221210 is an apocalyptic number.

121201221210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121201221210 is an abundant number, since it is smaller than the sum of its proper divisors (169681709766).

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

121201221210 is a wasteful number, since it uses less digits than its factorization.

121201221210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4040040717.

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

Adding to 121201221210 its reverse (12122102121), we get a palindrome (133323323331).

The spelling of 121201221210 in words is "one hundred twenty-one billion, two hundred one million, two hundred twenty-one thousand, two hundred ten".