121122220021 has 16 divisors (see below), whose sum is σ = 132643123200. Its totient is φ = 109687097520.

The previous prime is 121122220003. The next prime is 121122220027. The reversal of 121122220021 is 120022221121.

It is a happy number.

It is not a de Polignac number, because 121122220021 - 2⁷ = 121122219893 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121122219977 and 121122220004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121122220027) 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, 3030856 + ... + 3070558.

It is an arithmetic number, because the mean of its divisors is an integer number (8290195200).

Almost surely, 2^121122220021 is an apocalyptic number.

121122220021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

121122220021 is a deficient number, since it is larger than the sum of its proper divisors (11520903179).

121122220021 is a wasteful number, since it uses less digits than its factorization.

121122220021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40776.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 121122220021 its reverse (120022221121), we get a palindrome (241144441142).

It can be divided in two parts, 121122 and 220021, that added together give a palindrome (341143).

The spelling of 121122220021 in words is "one hundred twenty-one billion, one hundred twenty-two million, two hundred twenty thousand, twenty-one".