137288742821 has 4 divisors (see below), whose sum is σ = 138369756672. Its totient is φ = 136207728972.

The previous prime is 137288742691. The next prime is 137288742881. The reversal of 137288742821 is 128247882731.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-137288742821 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (137288742881) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 540506735 + ... + 540506988.

It is an arithmetic number, because the mean of its divisors is an integer number (34592439168).

Almost surely, 2^137288742821 is an apocalyptic number.

It is an amenable number.

137288742821 is a deficient number, since it is larger than the sum of its proper divisors (1081013851).

137288742821 is a wasteful number, since it uses less digits than its factorization.

137288742821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1081013850.

The product of its digits is 2408448, while the sum is 53.

The spelling of 137288742821 in words is "one hundred thirty-seven billion, two hundred eighty-eight million, seven hundred forty-two thousand, eight hundred twenty-one".