137336206921 has 9 divisors (see below), whose sum is σ = 139126303533. Its totient is φ = 135568867980.

The previous prime is 137336206897. The next prime is 137336206927. The reversal of 137336206921 is 129602633731.

It is a happy number.

The square root of 137336206921 is 370589.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 137336206921 - 2¹⁵ = 137336174153 is a prime.

It is a super-2 number, since 2×137336206921² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (137336206927) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 29274186 + ... + 29278876.

Almost surely, 2^137336206921 is an apocalyptic number.

137336206921 is the 370589-th square number.

137336206921 is the 185295-th centered octagonal number.

It is an amenable number.

137336206921 is a deficient number, since it is larger than the sum of its proper divisors (1790096612).

137336206921 is an frugal number, since it uses more digits than its factorization.

137336206921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9540 (or 4770 counting only the distinct ones).

The product of its (nonzero) digits is 244944, while the sum is 43.

The spelling of 137336206921 in words is "one hundred thirty-seven billion, three hundred thirty-six million, two hundred six thousand, nine hundred twenty-one".