21229452 has 36 divisors (see below), whose sum is σ = 55653416. Its totient is φ = 7076160.

The previous prime is 21229409. The next prime is 21229463. The reversal of 21229452 is 25492212.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9949 + ... + 11892.

Almost surely, 2^21229452 is an apocalyptic number.

It is an amenable number.

21229452 is an abundant number, since it is smaller than the sum of its proper divisors (34423964).

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

21229452 is a wasteful number, since it uses less digits than its factorization.

21229452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21860 (or 21846 counting only the distinct ones).

The product of its digits is 2880, while the sum is 27.

The square root of 21229452 is about 4607.5429460831. The cubic root of 21229452 is about 276.8936064792.

The spelling of 21229452 in words is "twenty-one million, two hundred twenty-nine thousand, four hundred fifty-two".