21231102 has 8 divisors (see below), whose sum is σ = 42462216. Its totient is φ = 7077032.

The previous prime is 21231029. The next prime is 21231107. The reversal of 21231102 is 20113212.

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

21231102 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21231107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1769253 + ... + 1769264.

It is an arithmetic number, because the mean of its divisors is an integer number (5307777).

Almost surely, 2^21231102 is an apocalyptic number.

21231102 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21231102 is a wasteful number, since it uses less digits than its factorization.

21231102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3538522.

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

The square root of 21231102 is about 4607.7219968223. The cubic root of 21231102 is about 276.9007798880.

Adding to 21231102 its reverse (20113212), we get a palindrome (41344314).

The spelling of 21231102 in words is "twenty-one million, two hundred thirty-one thousand, one hundred two".