21142113412 has 24 divisors (see below), whose sum is σ = 42289776704. Its totient is φ = 9059716512.

The previous prime is 21142113407. The next prime is 21142113413. The reversal of 21142113412 is 21431124112.

It is not an unprimeable number, because it can be changed into a prime (21142113413) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 187483 + ... + 278269.

Almost surely, 2^21142113412 is an apocalyptic number.

It is an amenable number.

21142113412 is an abundant number, since it is smaller than the sum of its proper divisors (21147663292).

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

21142113412 is a wasteful number, since it uses less digits than its factorization.

21142113412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99115 (or 99113 counting only the distinct ones).

The product of its digits is 384, while the sum is 22.

Adding to 21142113412 its reverse (21431124112), we get a palindrome (42573237524).

The spelling of 21142113412 in words is "twenty-one billion, one hundred forty-two million, one hundred thirteen thousand, four hundred twelve".