122100221021021 has 24 divisors (see below), whose sum is σ = 136666204111800. Its totient is φ = 108693093712896.

The previous prime is 122100221020997. The next prime is 122100221021033. The reversal of 122100221021021 is 120120122001221.

It can be written as a sum of positive squares in 4 ways, for example, as 1910352444025 + 120189868576996 = 1382155^2 + 10963114^2 .

It is not a de Polignac number, because 122100221021021 - 2⁴² = 117702174509917 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (122100221021071) 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, 12336446 + ... + 19909503.

It is an arithmetic number, because the mean of its divisors is an integer number (5694425171325).

Almost surely, 2^{122100221021021} is an apocalyptic number.

It is an amenable number.

122100221021021 is a deficient number, since it is larger than the sum of its proper divisors (14565983090779).

122100221021021 is a wasteful number, since it uses less digits than its factorization.

122100221021021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32246621 (or 32246602 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 122100221021021 its reverse (120120122001221), we get a palindrome (242220343022242).

The spelling of 122100221021021 in words is "one hundred twenty-two trillion, one hundred billion, two hundred twenty-one million, twenty-one thousand, twenty-one".