21671202 has 32 divisors (see below), whose sum is σ = 49762944. Its totient is φ = 6163200.

The previous prime is 21671197. The next prime is 21671213. The reversal of 21671202 is 20217612.

It is a super-2 number, since 2×21671202² = 939281992249608, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9052 + ... + 11192.

It is an arithmetic number, because the mean of its divisors is an integer number (1555092).

Almost surely, 2^21671202 is an apocalyptic number.

21671202 is an abundant number, since it is smaller than the sum of its proper divisors (28091742).

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

21671202 is a wasteful number, since it uses less digits than its factorization.

21671202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2394.

The product of its (nonzero) digits is 336, while the sum is 21.

The square root of 21671202 is about 4655.2338287137. The cubic root of 21671202 is about 278.8010040261.

Adding to 21671202 its reverse (20217612), we get a palindrome (41888814).

The spelling of 21671202 in words is "twenty-one million, six hundred seventy-one thousand, two hundred two".