21229476 has 24 divisors (see below), whose sum is σ = 49655424. Its totient is φ = 7059360.

The previous prime is 21229471. The next prime is 21229489. The reversal of 21229476 is 67492212.

It is not an unprimeable number, because it can be changed into a prime (21229471) 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, 3646 + ... + 7466.

It is an arithmetic number, because the mean of its divisors is an integer number (2068976).

Almost surely, 2^21229476 is an apocalyptic number.

It is an amenable number.

21229476 is an abundant number, since it is smaller than the sum of its proper divisors (28425948).

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

21229476 is a wasteful number, since it uses less digits than its factorization.

21229476 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4291 (or 4289 counting only the distinct ones).

The product of its digits is 12096, while the sum is 33.

The square root of 21229476 is about 4607.5455505073. The cubic root of 21229476 is about 276.8937108224.

The spelling of 21229476 in words is "twenty-one million, two hundred twenty-nine thousand, four hundred seventy-six".