121200221100010 has 64 divisors (see below), whose sum is σ = 238175132192928. Its totient is φ = 44135085993984.

The previous prime is 121200221100001. The next prime is 121200221100029. The reversal of 121200221100010 is 10001122002121.

It can be written as a sum of positive squares in 16 ways, for example, as 4094904346569 + 117105316753441 = 2023587^2 + 10821521^2 .

It is a Harshad number since it is a multiple of its sum of digits (13).

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, 155750854 + ... + 156527086.

Almost surely, 2^{121200221100010} is an apocalyptic number.

121200221100010 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121200221100010 is a deficient number, since it is larger than the sum of its proper divisors (116974911092918).

121200221100010 is a wasteful number, since it uses less digits than its factorization.

121200221100010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 792779.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 121200221100010 its reverse (10001122002121), we get a palindrome (131201343102131).

The spelling of 121200221100010 in words is "one hundred twenty-one trillion, two hundred billion, two hundred twenty-one million, one hundred thousand, ten".