13402821 has 8 divisors (see below), whose sum is σ = 17889984. Its totient is φ = 8925440.

The previous prime is 13402793. The next prime is 13402841. The reversal of 13402821 is 12820431.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 13402821 - 2⁹ = 13402309 is a prime.

It is a super-2 number, since 2×13402821² = 359271221516082, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13402841) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1816 + ... + 5486.

It is an arithmetic number, because the mean of its divisors is an integer number (2236248).

Almost surely, 2^13402821 is an apocalyptic number.

It is an amenable number.

13402821 is a deficient number, since it is larger than the sum of its proper divisors (4487163).

13402821 is a wasteful number, since it uses less digits than its factorization.

13402821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4891.

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 13402821 is about 3660.9863425039. The cubic root of 13402821 is about 237.5374404502.

The spelling of 13402821 in words is "thirteen million, four hundred two thousand, eight hundred twenty-one".