21131402412 has 12 divisors (see below), whose sum is σ = 49306605656. Its totient is φ = 7043800800.

The previous prime is 21131402401. The next prime is 21131402423. The reversal of 21131402412 is 21420413112.

It is an interprime number because it is at equal distance from previous prime (21131402401) and next prime (21131402423).

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 880475089 + ... + 880475112.

Almost surely, 2^21131402412 is an apocalyptic number.

It is an amenable number.

21131402412 is an abundant number, since it is smaller than the sum of its proper divisors (28175203244).

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

21131402412 is a wasteful number, since it uses less digits than its factorization.

21131402412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1760950208 (or 1760950206 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 21.

Adding to 21131402412 its reverse (21420413112), we get a palindrome (42551815524).

The spelling of 21131402412 in words is "twenty-one billion, one hundred thirty-one million, four hundred two thousand, four hundred twelve".