231421516 has 6 divisors (see below), whose sum is σ = 404987660. Its totient is φ = 115710756.

The previous prime is 231421499. The next prime is 231421523. The reversal of 231421516 is 615124132.

It is a happy number.

It is a super-3 number, since 3×231421516³ (a number of 26 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28927686 + ... + 28927693.

Almost surely, 2^231421516 is an apocalyptic number.

It is an amenable number.

231421516 is a deficient number, since it is larger than the sum of its proper divisors (173566144).

231421516 is a wasteful number, since it uses less digits than its factorization.

231421516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57855383 (or 57855381 counting only the distinct ones).

The product of its digits is 1440, while the sum is 25.

The square root of 231421516 is about 15212.5446917996. The cubic root of 231421516 is about 613.9522256611.

Adding to 231421516 its reverse (615124132), we get a palindrome (846545648).

The spelling of 231421516 in words is "two hundred thirty-one million, four hundred twenty-one thousand, five hundred sixteen".