21341431 has 8 divisors (see below), whose sum is σ = 21934080. Its totient is φ = 20754648.

The previous prime is 21341407. The next prime is 21341479. The reversal of 21341431 is 13414312.

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

It is a cyclic number.

It is not a de Polignac number, because 21341431 - 2¹⁵ = 21308663 is a prime.

It is a super-2 number, since 2×21341431² = 910913354255522, 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 = 21341399 and 21341408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21341491) 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, 6490 + ... + 9208.

It is an arithmetic number, because the mean of its divisors is an integer number (2741760).

Almost surely, 2^21341431 is an apocalyptic number.

21341431 is a deficient number, since it is larger than the sum of its proper divisors (592649).

21341431 is a wasteful number, since it uses less digits than its factorization.

21341431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2933.

The product of its digits is 288, while the sum is 19.

The square root of 21341431 is about 4619.6786684790. The cubic root of 21341431 is about 277.3795966042.

Adding to 21341431 its reverse (13414312), we get a palindrome (34755743).

It can be divided in two parts, 2 and 1341431, that multiplied together give a palindrome (2682862).

The spelling of 21341431 in words is "twenty-one million, three hundred forty-one thousand, four hundred thirty-one".