21850431 has 8 divisors (see below), whose sum is σ = 29205120. Its totient is φ = 14531352.

The previous prime is 21850429. The next prime is 21850453. The reversal of 21850431 is 13405812.

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

It is not a de Polignac number, because 21850431 - 2¹ = 21850429 is a prime.

It is a super-2 number, since 2×21850431² = 954882669771522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21852431) 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, 7435 + ... + 9948.

It is an arithmetic number, because the mean of its divisors is an integer number (3650640).

Almost surely, 2^21850431 is an apocalyptic number.

21850431 is a deficient number, since it is larger than the sum of its proper divisors (7354689).

21850431 is a wasteful number, since it uses less digits than its factorization.

21850431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17805.

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 21850431 is about 4674.4444589705. Note that the first 4 decimals coincide. The cubic root of 21850431 is about 279.5674912726.

The spelling of 21850431 in words is "twenty-one million, eight hundred fifty thousand, four hundred thirty-one".