122011000021 has 2 divisors, whose sum is σ = 122011000022. Its totient is φ = 122011000020.

The previous prime is 122010999989. The next prime is 122011000043. The reversal of 122011000021 is 120000110221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 112064927121 + 9946072900 = 334761^2 + 99730^2 .

It is a cyclic number.

It is not a de Polignac number, because 122011000021 - 2⁵ = 122010999989 is a prime.

It is a super-2 number, since 2×122011000021² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 122010999971 and 122011000007.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (122011000051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61005500010 + 61005500011.

It is an arithmetic number, because the mean of its divisors is an integer number (61005500011).

Almost surely, 2^122011000021 is an apocalyptic number.

It is an amenable number.

122011000021 is a deficient number, since it is larger than the sum of its proper divisors (1).

122011000021 is an equidigital number, since it uses as much as digits as its factorization.

122011000021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 122011000021 its reverse (120000110221), we get a palindrome (242011110242).

The spelling of 122011000021 in words is "one hundred twenty-two billion, eleven million, twenty-one", and thus it is an aban number.