21431050 has 48 divisors (see below), whose sum is σ = 44461440. Its totient is φ = 7637760.

The previous prime is 21431023. The next prime is 21431057. The reversal of 21431050 is 5013412.

It is not an unprimeable number, because it can be changed into a prime (21431057) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15487 + ... + 16813.

It is an arithmetic number, because the mean of its divisors is an integer number (926280).

Almost surely, 2^21431050 is an apocalyptic number.

21431050 is an abundant number, since it is smaller than the sum of its proper divisors (23030390).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21431050 is a wasteful number, since it uses less digits than its factorization.

21431050 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1375 (or 1370 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 21431050 is about 4629.3682074339. The cubic root of 21431050 is about 277.7673207915.

Adding to 21431050 its reverse (5013412), we get a palindrome (26444462).

The spelling of 21431050 in words is "twenty-one million, four hundred thirty-one thousand, fifty".