21470202 has 24 divisors (see below), whose sum is σ = 50097684. Its totient is φ = 6606144.

The previous prime is 21470149. The next prime is 21470219. The reversal of 21470202 is 20207412.

It can be written as a sum of positive squares in 2 ways, for example, as 20875761 + 594441 = 4569^2 + 771^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

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, 45643 + ... + 46110.

Almost surely, 2^21470202 is an apocalyptic number.

21470202 is an abundant number, since it is smaller than the sum of its proper divisors (28627482).

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

21470202 is a wasteful number, since it uses less digits than its factorization.

21470202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91774 (or 91771 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 18.

The square root of 21470202 is about 4633.5949326630. The cubic root of 21470202 is about 277.9363672657.

Adding to 21470202 its reverse (20207412), we get a palindrome (41677614).

The spelling of 21470202 in words is "twenty-one million, four hundred seventy thousand, two hundred two".