21231196 has 24 divisors (see below), whose sum is σ = 42577920. Its totient is φ = 9074352.

The previous prime is 21231173. The next prime is 21231241. The reversal of 21231196 is 69113212.

It is a self number, because there is not a number n which added to its sum of digits gives 21231196.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12621 + ... + 14203.

It is an arithmetic number, because the mean of its divisors is an integer number (1774080).

Almost surely, 2^21231196 is an apocalyptic number.

It is an amenable number.

21231196 is an abundant number, since it is smaller than the sum of its proper divisors (21346724).

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

21231196 is a wasteful number, since it uses less digits than its factorization.

21231196 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2073 (or 2071 counting only the distinct ones).

The product of its digits is 648, while the sum is 25.

The square root of 21231196 is about 4607.7321970792. The cubic root of 21231196 is about 276.9011885438.

The spelling of 21231196 in words is "twenty-one million, two hundred thirty-one thousand, one hundred ninety-six".