21229002 has 12 divisors (see below), whose sum is σ = 45996210. Its totient is φ = 7076328.

The previous prime is 21229001. The next prime is 21229031. The reversal of 21229002 is 20092212.

It can be written as a sum of positive squares in only one way, i.e., 15280281 + 5948721 = 3909^2 + 2439^2 .

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 1179389 = 21229002 / (2 + 1 + 2 + 2 + 9 + 0 + 0 + 2).

It is not an unprimeable number, because it can be changed into a prime (21229001) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 589677 + ... + 589712.

Almost surely, 2^21229002 is an apocalyptic number.

21229002 is an abundant number, since it is smaller than the sum of its proper divisors (24767208).

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

21229002 is a wasteful number, since it uses less digits than its factorization.

21229002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1179397 (or 1179394 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 21229002 is about 4607.4941128557. The cubic root of 21229002 is about 276.8916500305.

The spelling of 21229002 in words is "twenty-one million, two hundred twenty-nine thousand, two".