21154431414 has 16 divisors (see below), whose sum is σ = 42562211328. Its totient is φ = 7009252392.

The previous prime is 21154431407. The next prime is 21154431479. The reversal of 21154431414 is 41413445112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10555102 + ... + 10557105.

It is an arithmetic number, because the mean of its divisors is an integer number (2660138208).

Almost surely, 2^21154431414 is an apocalyptic number.

21154431414 is an abundant number, since it is smaller than the sum of its proper divisors (21407779914).

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

21154431414 is a wasteful number, since it uses less digits than its factorization.

21154431414 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21112379.

The product of its digits is 7680, while the sum is 30.

Adding to 21154431414 its reverse (41413445112), we get a palindrome (62567876526).

The spelling of 21154431414 in words is "twenty-one billion, one hundred fifty-four million, four hundred thirty-one thousand, four hundred fourteen".