21374031 has 16 divisors (see below), whose sum is σ = 34284800. Its totient is φ = 11570688.

The previous prime is 21374029. The next prime is 21374051. The reversal of 21374031 is 13047312.

It is not a de Polignac number, because 21374031 - 2¹ = 21374029 is a prime.

It is a super-2 number, since 2×21374031² = 913698402377922, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21373989 and 21374007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21374011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26386 + ... + 27183.

It is an arithmetic number, because the mean of its divisors is an integer number (2142800).

Almost surely, 2^21374031 is an apocalyptic number.

21374031 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21374031 is a deficient number, since it is larger than the sum of its proper divisors (12910769).

21374031 is a wasteful number, since it uses less digits than its factorization.

21374031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53598.

The product of its (nonzero) digits is 504, while the sum is 21.

The square root of 21374031 is about 4623.2057060010. The cubic root of 21374031 is about 277.5207613718.

The spelling of 21374031 in words is "twenty-one million, three hundred seventy-four thousand, thirty-one".