22121510121 has 12 divisors (see below), whose sum is σ = 31954599300. Its totient is φ = 14747070240.

The previous prime is 22121510119. The next prime is 22121510123. The reversal of 22121510121 is 12101512122.

22121510121 is a `hidden beast` number, since 22 + 12 + 1 + 510 + 121 = 666.

It is an interprime number because it is at equal distance from previous prime (22121510119) and next prime (22121510123).

It can be written as a sum of positive squares in 2 ways, for example, as 3499905600 + 18621604521 = 59160^2 + 136461^2 .

It is not a de Polignac number, because 22121510121 - 2¹ = 22121510119 is a prime.

It is a super-2 number, since 2×22121510121² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 22121510094 and 22121510103.

It is not an unprimeable number, because it can be changed into a prime (22121510123) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 348555 + ... + 407103.

It is an arithmetic number, because the mean of its divisors is an integer number (2662883275).

Almost surely, 2^22121510121 is an apocalyptic number.

It is an amenable number.

22121510121 is a deficient number, since it is larger than the sum of its proper divisors (9833089179).

22121510121 is a wasteful number, since it uses less digits than its factorization.

22121510121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100536 (or 100533 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 18.

The spelling of 22121510121 in words is "twenty-two billion, one hundred twenty-one million, five hundred ten thousand, one hundred twenty-one".