21154431130 has 32 divisors (see below), whose sum is σ = 44338783104. Its totient is φ = 7116098496.

The previous prime is 21154431127. The next prime is 21154431149. The reversal of 21154431130 is 3113445112.

It is a junction number, because it is equal to n+sod(n) for n = 21154431095 and 21154431104.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2847292 + ... + 2854711.

It is an arithmetic number, because the mean of its divisors is an integer number (1385586972).

Almost surely, 2^21154431130 is an apocalyptic number.

21154431130 is an abundant number, since it is smaller than the sum of its proper divisors (23184351974).

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

21154431130 is a wasteful number, since it uses less digits than its factorization.

21154431130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5702070.

The product of its (nonzero) digits is 1440, while the sum is 25.

Adding to 21154431130 its reverse (3113445112), we get a palindrome (24267876242).

The spelling of 21154431130 in words is "twenty-one billion, one hundred fifty-four million, four hundred thirty-one thousand, one hundred thirty".