122100211222021 has 4 divisors (see below), whose sum is σ = 122115305829100. Its totient is φ = 122085116614944.

The previous prime is 122100211222013. The next prime is 122100211222027. The reversal of 122100211222021 is 120222112001221.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 58985687085796 + 63114524136225 = 7680214^2 + 7944465^2 .

It is a cyclic number.

It is not a de Polignac number, because 122100211222021 - 2³ = 122100211222013 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 122100211222021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (122100211222027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7547291406 + ... + 7547307583.

It is an arithmetic number, because the mean of its divisors is an integer number (30528826457275).

Almost surely, 2^{122100211222021} is an apocalyptic number.

It is an amenable number.

122100211222021 is a deficient number, since it is larger than the sum of its proper divisors (15094607079).

122100211222021 is an equidigital number, since it uses as much as digits as its factorization.

122100211222021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15094607078.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 122100211222021 its reverse (120222112001221), we get a palindrome (242322323223242).

The spelling of 122100211222021 in words is "one hundred twenty-two trillion, one hundred billion, two hundred eleven million, two hundred twenty-two thousand, twenty-one".