21613766142 has 16 divisors (see below), whose sum is σ = 43313477760. Its totient is φ = 7190264472.

The previous prime is 21613766113. The next prime is 21613766147. The reversal of 21613766142 is 24166731612.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21613766142.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21613766147) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 3577792 + ... + 3583827.

It is an arithmetic number, because the mean of its divisors is an integer number (2707092360).

Almost surely, 2^21613766142 is an apocalyptic number.

21613766142 is an abundant number, since it is smaller than the sum of its proper divisors (21699711618).

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

21613766142 is a wasteful number, since it uses less digits than its factorization.

21613766142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7162127.

The product of its digits is 72576, while the sum is 39.

The spelling of 21613766142 in words is "twenty-one billion, six hundred thirteen million, seven hundred sixty-six thousand, one hundred forty-two".