21013431214 has 16 divisors (see below), whose sum is σ = 31752816480. Its totient is φ = 10429444480.

The previous prime is 21013431211. The next prime is 21013431239. The reversal of 21013431214 is 41213431012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21013431211) 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, 76722 + ... + 218890.

It is an arithmetic number, because the mean of its divisors is an integer number (1984551030).

Almost surely, 2^21013431214 is an apocalyptic number.

21013431214 is a deficient number, since it is larger than the sum of its proper divisors (10739385266).

21013431214 is a wasteful number, since it uses less digits than its factorization.

21013431214 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142715.

The product of its (nonzero) digits is 576, while the sum is 22.

Adding to 21013431214 its reverse (41213431012), we get a palindrome (62226862226).

The spelling of 21013431214 in words is "twenty-one billion, thirteen million, four hundred thirty-one thousand, two hundred fourteen".