21239196 has 24 divisors (see below), whose sum is σ = 54063744. Its totient is φ = 6436080.

The previous prime is 21239191. The next prime is 21239203. The reversal of 21239196 is 69193212.

It is a super-2 number, since 2×21239196² = 902206893452832, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21239191) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 80320 + ... + 80583.

It is an arithmetic number, because the mean of its divisors is an integer number (2252656).

Almost surely, 2^21239196 is an apocalyptic number.

It is an amenable number.

21239196 is an abundant number, since it is smaller than the sum of its proper divisors (32824548).

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

21239196 is a wasteful number, since it uses less digits than its factorization.

21239196 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160921 (or 160919 counting only the distinct ones).

The product of its digits is 5832, while the sum is 33.

The square root of 21239196 is about 4608.6002213253. The cubic root of 21239196 is about 276.9359633367.

The spelling of 21239196 in words is "twenty-one million, two hundred thirty-nine thousand, one hundred ninety-six".