121200211020021 has 16 divisors (see below), whose sum is σ = 188615525965824. Its totient is φ = 67783704642864.

The previous prime is 121200211020019. The next prime is 121200211020137. The reversal of 121200211020021 is 120020112002121.

It is not a de Polignac number, because 121200211020021 - 2¹ = 121200211020019 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121200211020001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 61398282205 + ... + 61398284178.

It is an arithmetic number, because the mean of its divisors is an integer number (11788470372864).

Almost surely, 2^{121200211020021} is an apocalyptic number.

It is an amenable number.

121200211020021 is a deficient number, since it is larger than the sum of its proper divisors (67415314945803).

121200211020021 is a wasteful number, since it uses less digits than its factorization.

121200211020021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122796566440.

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

Adding to 121200211020021 its reverse (120020112002121), we get a palindrome (241220323022142).

The spelling of 121200211020021 in words is "one hundred twenty-one trillion, two hundred billion, two hundred eleven million, twenty thousand, twenty-one".