137207021 has 8 divisors (see below), whose sum is σ = 158331264. Its totient is φ = 116463600.

The previous prime is 137207009. The next prime is 137207027. The reversal of 137207021 is 120702731.

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

It is a cyclic number.

It is not a de Polignac number, because 137207021 - 2⁶ = 137206957 is a prime.

It is a super-2 number, since 2×137207021² = 37651533223388882, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (137207027) 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, 94430 + ... + 95871.

It is an arithmetic number, because the mean of its divisors is an integer number (19791408).

Almost surely, 2^137207021 is an apocalyptic number.

It is an amenable number.

137207021 is a deficient number, since it is larger than the sum of its proper divisors (21124243).

137207021 is a wasteful number, since it uses less digits than its factorization.

137207021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 190411.

The product of its (nonzero) digits is 588, while the sum is 23.

The square root of 137207021 is about 11713.5400712167. The cubic root of 137207021 is about 515.7732074777.

Adding to 137207021 its reverse (120702731), we get a palindrome (257909752).

The spelling of 137207021 in words is "one hundred thirty-seven million, two hundred seven thousand, twenty-one".