137221210561 has 4 divisors (see below), whose sum is σ = 137234104624. Its totient is φ = 137208316500.

The previous prime is 137221210531. The next prime is 137221210583. The reversal of 137221210561 is 165012122731.

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 not a de Polignac number, because 137221210561 - 2²⁵ = 137187656129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (137221210531) 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, 6431055 + ... + 6452356.

It is an arithmetic number, because the mean of its divisors is an integer number (34308526156).

Almost surely, 2^137221210561 is an apocalyptic number.

It is an amenable number.

137221210561 is a deficient number, since it is larger than the sum of its proper divisors (12894063).

137221210561 is a wasteful number, since it uses less digits than its factorization.

137221210561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12894062.

The product of its (nonzero) digits is 5040, while the sum is 31.

The spelling of 137221210561 in words is "one hundred thirty-seven billion, two hundred twenty-one million, two hundred ten thousand, five hundred sixty-one".