21121430432412 has 24 divisors (see below), whose sum is σ = 49283459114512. Its totient is φ = 7040459462400.

The previous prime is 21121430432383. The next prime is 21121430432447. The reversal of 21121430432412 is 21423403412112.

It is a happy number.

It is a super-2 number, since 2×21121430432412² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21121430432412.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3496212 + ... + 7380132.

Almost surely, 2^{21121430432412} is an apocalyptic number.

It is an amenable number.

21121430432412 is an abundant number, since it is smaller than the sum of its proper divisors (28162028682100).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21121430432412 is a wasteful number, since it uses less digits than its factorization.

21121430432412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4337109 (or 4337107 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 30.

Adding to 21121430432412 its reverse (21423403412112), we get a palindrome (42544833844524).

The spelling of 21121430432412 in words is "twenty-one trillion, one hundred twenty-one billion, four hundred thirty million, four hundred thirty-two thousand, four hundred twelve".