21220492 has 24 divisors (see below), whose sum is σ = 40355840. Its totient is φ = 9726480.

The previous prime is 21220487. The next prime is 21220501. The reversal of 21220492 is 29402212.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2148 + ... + 6859.

Almost surely, 2^21220492 is an apocalyptic number.

It is an amenable number.

21220492 is a deficient number, since it is larger than the sum of its proper divisors (19135348).

21220492 is a wasteful number, since it uses less digits than its factorization.

21220492 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9061 (or 9059 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 21220492 is about 4606.5705248048. The cubic root of 21220492 is about 276.8546462047.

It can be divided in two parts, 21220 and 492, that added together give a palindrome (21712).

The spelling of 21220492 in words is "twenty-one million, two hundred twenty thousand, four hundred ninety-two".