21013402 has 16 divisors (see below), whose sum is σ = 32826024. Its totient is φ = 10080000.

The previous prime is 21013397. The next prime is 21013417. The reversal of 21013402 is 20431012.

It can be written as a sum of positive squares in 4 ways, for example, as 2099601 + 18913801 = 1449^2 + 4349^2 .

It is a super-2 number, since 2×21013402² = 883126127227208, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2902 + ... + 7102.

Almost surely, 2^21013402 is an apocalyptic number.

21013402 is a deficient number, since it is larger than the sum of its proper divisors (11812622).

21013402 is a wasteful number, since it uses less digits than its factorization.

21013402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4305.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 21013402 is about 4584.0377398097. The cubic root of 21013402 is about 275.9510957951.

Adding to 21013402 its reverse (20431012), we get a palindrome (41444414).

The spelling of 21013402 in words is "twenty-one million, thirteen thousand, four hundred two".