21760401 has 16 divisors (see below), whose sum is σ = 31332224. Its totient is φ = 13353984.

The previous prime is 21760399. The next prime is 21760489. The reversal of 21760401 is 10406712.

It is not a de Polignac number, because 21760401 - 2¹ = 21760399 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21760801) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22020 + ... + 22986.

It is an arithmetic number, because the mean of its divisors is an integer number (1958264).

Almost surely, 2^21760401 is an apocalyptic number.

It is an amenable number.

21760401 is a deficient number, since it is larger than the sum of its proper divisors (9571823).

21760401 is a wasteful number, since it uses less digits than its factorization.

21760401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1560.

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

The square root of 21760401 is about 4664.8044975111. The cubic root of 21760401 is about 279.1829968121.

The spelling of 21760401 in words is "twenty-one million, seven hundred sixty thousand, four hundred one".