137221530 has 64 divisors (see below), whose sum is σ = 340599168. Its totient is φ = 35354880.

The previous prime is 137221523. The next prime is 137221541. The reversal of 137221530 is 35122731.

137221530 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 137221530.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 200569 + ... + 201251.

It is an arithmetic number, because the mean of its divisors is an integer number (5321862).

Almost surely, 2^137221530 is an apocalyptic number.

137221530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 137221530, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (170299584).

137221530 is an abundant number, since it is smaller than the sum of its proper divisors (203377638).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

137221530 is a wasteful number, since it uses less digits than its factorization.

137221530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 911.

The product of its (nonzero) digits is 1260, while the sum is 24.

The square root of 137221530 is about 11714.1593808519. The cubic root of 137221530 is about 515.7913870374.

The spelling of 137221530 in words is "one hundred thirty-seven million, two hundred twenty-one thousand, five hundred thirty".