21031433214 has 64 divisors (see below), whose sum is σ = 47370140928. Its totient is φ = 6169766400.

The previous prime is 21031433183. The next prime is 21031433233. The reversal of 21031433214 is 41233413012.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 287904 + ... + 353484.

It is an arithmetic number, because the mean of its divisors is an integer number (740158452).

Almost surely, 2^21031433214 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21031433214, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23685070464).

21031433214 is an abundant number, since it is smaller than the sum of its proper divisors (26338707714).

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

21031433214 is a wasteful number, since it uses less digits than its factorization.

21031433214 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65753.

The product of its (nonzero) digits is 1728, while the sum is 24.

Adding to 21031433214 its reverse (41233413012), we get a palindrome (62264846226).

The spelling of 21031433214 in words is "twenty-one billion, thirty-one million, four hundred thirty-three thousand, two hundred fourteen".