21474031 has 2 divisors, whose sum is σ = 21474032. Its totient is φ = 21474030.

The previous prime is 21473987. The next prime is 21474059. The reversal of 21474031 is 13047412.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21474031 - 2¹⁹ = 20949743 is a prime.

It is a super-2 number, since 2×21474031² = 922268014777922, which contains 22 as substring.

It is a plaindrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 21473993 and 21474011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21474091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10737015 + 10737016.

It is an arithmetic number, because the mean of its divisors is an integer number (10737016).

Almost surely, 2^21474031 is an apocalyptic number.

21474031 is a deficient number, since it is larger than the sum of its proper divisors (1).

21474031 is an equidigital number, since it uses as much as digits as its factorization.

21474031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 672, while the sum is 22.

The square root of 21474031 is about 4634.0080923537. The cubic root of 21474031 is about 277.9528886922.

The spelling of 21474031 in words is "twenty-one million, four hundred seventy-four thousand, thirty-one".