21419431 has 8 divisors (see below), whose sum is σ = 23716224. Its totient is φ = 19180920.

The previous prime is 21419401. The next prime is 21419449. The reversal of 21419431 is 13491412.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21419431 - 2⁵ = 21419399 is a prime.

It is a super-2 number, since 2×21419431² = 917584048727522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21419396 and 21419405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21419401) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13795 + ... + 15268.

It is an arithmetic number, because the mean of its divisors is an integer number (2964528).

Almost surely, 2^21419431 is an apocalyptic number.

21419431 is a deficient number, since it is larger than the sum of its proper divisors (2296793).

21419431 is a wasteful number, since it uses less digits than its factorization.

21419431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29141.

The product of its digits is 864, while the sum is 25.

The square root of 21419431 is about 4628.1131144344. The cubic root of 21419431 is about 277.7171138577.

The spelling of 21419431 in words is "twenty-one million, four hundred nineteen thousand, four hundred thirty-one".