21226996 has 18 divisors (see below), whose sum is σ = 43212498. Its totient is φ = 9097200.

The previous prime is 21226969. The next prime is 21227023. The reversal of 21226996 is 69962212.

It is an interprime number because it is at equal distance from previous prime (21226969) and next prime (21227023).

It can be written as a sum of positive squares in only one way, i.e., 20830096 + 396900 = 4564^2 + 630^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 53955 + ... + 54346.

Almost surely, 2^21226996 is an apocalyptic number.

It is an amenable number.

21226996 is an abundant number, since it is smaller than the sum of its proper divisors (21985502).

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

21226996 is a wasteful number, since it uses less digits than its factorization.

21226996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108319 (or 108310 counting only the distinct ones).

The product of its digits is 23328, while the sum is 37.

The square root of 21226996 is about 4607.2764188835. The cubic root of 21226996 is about 276.8829282805.

It can be divided in two parts, 21226 and 996, that added together give a palindrome (22222).

The spelling of 21226996 in words is "twenty-one million, two hundred twenty-six thousand, nine hundred ninety-six".