21231431214 has 64 divisors (see below), whose sum is σ = 48958981632. Its totient is φ = 6012489600.

The previous prime is 21231431209. The next prime is 21231431219. The reversal of 21231431214 is 41213413212.

It is an interprime number because it is at equal distance from previous prime (21231431209) and next prime (21231431219).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21231431219) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5835804 + ... + 5839440.

It is an arithmetic number, because the mean of its divisors is an integer number (764984088).

Almost surely, 2^21231431214 is an apocalyptic number.

21231431214 is an abundant number, since it is smaller than the sum of its proper divisors (27727550418).

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

21231431214 is a wasteful number, since it uses less digits than its factorization.

21231431214 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4841.

The product of its digits is 1152, while the sum is 24.

Adding to 21231431214 its reverse (41213413212), we get a palindrome (62444844426).

The spelling of 21231431214 in words is "twenty-one billion, two hundred thirty-one million, four hundred thirty-one thousand, two hundred fourteen".