21374049 has 32 divisors (see below), whose sum is σ = 31781376. Its totient is φ = 12718080.

The previous prime is 21374029. The next prime is 21374051. The reversal of 21374049 is 94047312.

It is a happy number.

It is not a de Polignac number, because 21374049 - 2¹⁹ = 20849761 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21374029) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 88569 + ... + 88809.

It is an arithmetic number, because the mean of its divisors is an integer number (993168).

Almost surely, 2^21374049 is an apocalyptic number.

It is an amenable number.

21374049 is a deficient number, since it is larger than the sum of its proper divisors (10407327).

21374049 is a wasteful number, since it uses less digits than its factorization.

21374049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 345.

The product of its (nonzero) digits is 6048, while the sum is 30.

The square root of 21374049 is about 4623.2076527017. The cubic root of 21374049 is about 277.5208392758.

The spelling of 21374049 in words is "twenty-one million, three hundred seventy-four thousand, forty-nine".