21229492 has 6 divisors (see below), whose sum is σ = 37151618. Its totient is φ = 10614744.

The previous prime is 21229489. The next prime is 21229501. The reversal of 21229492 is 29492212.

It can be written as a sum of positive squares in only one way, i.e., 21123216 + 106276 = 4596^2 + 326^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2653683 + ... + 2653690.

Almost surely, 2^21229492 is an apocalyptic number.

It is an amenable number.

21229492 is a deficient number, since it is larger than the sum of its proper divisors (15922126).

21229492 is a wasteful number, since it uses less digits than its factorization.

21229492 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5307377 (or 5307375 counting only the distinct ones).

The product of its digits is 5184, while the sum is 31.

The square root of 21229492 is about 4607.5472867894. The cubic root of 21229492 is about 276.8937803844.

The spelling of 21229492 in words is "twenty-one million, two hundred twenty-nine thousand, four hundred ninety-two".