122121210021 has 24 divisors (see below), whose sum is σ = 170257038336. Its totient is φ = 77855426880.

The previous prime is 122121210007. The next prime is 122121210031. The reversal of 122121210021 is 120012121221.

It is not a de Polignac number, because 122121210021 - 2¹⁵ = 122121177253 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (122121210031) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9631516 + ... + 9644186.

It is an arithmetic number, because the mean of its divisors is an integer number (7094043264).

Almost surely, 2^122121210021 is an apocalyptic number.

It is an amenable number.

122121210021 is a deficient number, since it is larger than the sum of its proper divisors (48135828315).

122121210021 is a wasteful number, since it uses less digits than its factorization.

122121210021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18793 (or 18770 counting only the distinct ones).

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

Adding to 122121210021 its reverse (120012121221), we get a palindrome (242133331242).

The spelling of 122121210021 in words is "one hundred twenty-two billion, one hundred twenty-one million, two hundred ten thousand, twenty-one".