231220101 has 16 divisors (see below), whose sum is σ = 370880000. Its totient is φ = 125171568.

The previous prime is 231220097. The next prime is 231220153. The reversal of 231220101 is 101022132.

It is not a de Polignac number, because 231220101 - 2² = 231220097 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231220001) 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, 289351 + ... + 290148.

It is an arithmetic number, because the mean of its divisors is an integer number (23180000).

Almost surely, 2^231220101 is an apocalyptic number.

231220101 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

231220101 is a deficient number, since it is larger than the sum of its proper divisors (139659899).

231220101 is a wasteful number, since it uses less digits than its factorization.

231220101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 579528.

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 231220101 is about 15205.9232209031. The cubic root of 231220101 is about 613.7740585915.

Adding to 231220101 its reverse (101022132), we get a palindrome (332242233).

The spelling of 231220101 in words is "two hundred thirty-one million, two hundred twenty thousand, one hundred one".