37521421 has 16 divisors (see below), whose sum is σ = 43718400. Its totient is φ = 31540608.

The previous prime is 37521401. The next prime is 37521433. The reversal of 37521421 is 12412573.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 37521421 - 2²³ = 29132813 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 (37521401) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 142536 + ... + 142798.

It is an arithmetic number, because the mean of its divisors is an integer number (2732400).

Almost surely, 2^37521421 is an apocalyptic number.

It is an amenable number.

37521421 is a deficient number, since it is larger than the sum of its proper divisors (6196979).

37521421 is a wasteful number, since it uses less digits than its factorization.

37521421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 588.

The product of its digits is 1680, while the sum is 25.

The square root of 37521421 is about 6125.4731245839. The cubic root of 37521421 is about 334.7801959017.

Adding to 37521421 its reverse (12412573), we get a palindrome (49933994).

The spelling of 37521421 in words is "thirty-seven million, five hundred twenty-one thousand, four hundred twenty-one".