13402921 has 9 divisors (see below), whose sum is σ = 15621021.
Its totient is φ = 11466252.
The previous prime is 13402913. The next prime is 13402937. The reversal of 13402921 is 12920431.
The square root of 13402921 is 3661.
It is a perfect power (a square), and thus also a powerful number.
It is not a de Polignac number, because 13402921 - 23 = 13402913 is a prime.
It is a Duffinian number.
It is a junction number, because it is equal to n+sod(n) for n = 13402892 and 13402901.
It is not an unprimeable number, because it can be changed into a prime (13400921) by changing a digit.
It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 25366 + ... + 25888.
It is an arithmetic number, because the mean of its divisors is an integer number (1735669).
Almost surely, 213402921 is an apocalyptic number.
13402921 is the 3661-st square number.
13402921 is the 1831-st centered octagonal number.
It is an amenable number.
13402921 is a deficient number, since it is larger than the sum of its proper divisors (2218100).
13402921 is an frugal number, since it uses more digits than its factorization.
13402921 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 1060 (or 530 counting only the distinct ones).
The product of its (nonzero) digits is 432, while the sum is 22.
The cubic root of 13402921 is about 237.5380312135.
The spelling of 13402921 in words is "thirteen million, four hundred two thousand, nine hundred twenty-one".