21492542137 has 8 divisors (see below), whose sum is σ = 23796356832. Its totient is φ = 19247052000.

The previous prime is 21492542083. The next prime is 21492542167. The reversal of 21492542137 is 73124529412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-21492542137 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21492542137.

It is not an unprimeable number, because it can be changed into a prime (21492542167) 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, 14580364 + ... + 14581837.

It is an arithmetic number, because the mean of its divisors is an integer number (2974544604).

Almost surely, 2^21492542137 is an apocalyptic number.

It is an amenable number.

21492542137 is a deficient number, since it is larger than the sum of its proper divisors (2303814695).

21492542137 is a wasteful number, since it uses less digits than its factorization.

21492542137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29162279.

The product of its digits is 120960, while the sum is 40.

The spelling of 21492542137 in words is "twenty-one billion, four hundred ninety-two million, five hundred forty-two thousand, one hundred thirty-seven".