22121010102421 has 2 divisors, whose sum is σ = 22121010102422. Its totient is φ = 22121010102420.

The previous prime is 22121010102361. The next prime is 22121010102427. The reversal of 22121010102421 is 12420101012122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12348821499921 + 9772188602500 = 3514089^2 + 3126050^2 .

It is a cyclic number.

It is not a de Polignac number, because 22121010102421 - 2⁷ = 22121010102293 is a prime.

It is a super-2 number, since 2×22121010102421² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22121010102427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11060505051210 + 11060505051211.

It is an arithmetic number, because the mean of its divisors is an integer number (11060505051211).

Almost surely, 2^{22121010102421} is an apocalyptic number.

It is an amenable number.

22121010102421 is a deficient number, since it is larger than the sum of its proper divisors (1).

22121010102421 is an equidigital number, since it uses as much as digits as its factorization.

22121010102421 is an evil number, because the sum of its binary digits is even.

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

Adding to 22121010102421 its reverse (12420101012122), we get a palindrome (34541111114543).

The spelling of 22121010102421 in words is "twenty-two trillion, one hundred twenty-one billion, ten million, one hundred two thousand, four hundred twenty-one".