122011021921 has 2 divisors, whose sum is σ = 122011021922. Its totient is φ = 122011021920.

The previous prime is 122011021901. The next prime is 122011021949. The reversal of 122011021921 is 129120110221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 70245671521 + 51765350400 = 265039^2 + 227520^2 .

It is a cyclic number.

It is not a de Polignac number, because 122011021921 - 2¹⁷ = 122010890849 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 122011021892 and 122011021901.

It is not a weakly prime, because it can be changed into another prime (122011021901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61005510960 + 61005510961.

It is an arithmetic number, because the mean of its divisors is an integer number (61005510961).

Almost surely, 2^122011021921 is an apocalyptic number.

It is an amenable number.

122011021921 is a deficient number, since it is larger than the sum of its proper divisors (1).

122011021921 is an equidigital number, since it uses as much as digits as its factorization.

122011021921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 22.

The spelling of 122011021921 in words is "one hundred twenty-two billion, eleven million, twenty-one thousand, nine hundred twenty-one".