21154414332 has 48 divisors (see below), whose sum is σ = 53166565760. Its totient is φ = 6524981568.

The previous prime is 21154414331. The next prime is 21154414397. The reversal of 21154414332 is 23341445112.

It is a self number, because there is not a number n which added to its sum of digits gives 21154414332.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21154414331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1069063 + ... + 1088670.

Almost surely, 2^21154414332 is an apocalyptic number.

It is an amenable number.

21154414332 is an abundant number, since it is smaller than the sum of its proper divisors (32012151428).

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

21154414332 is a wasteful number, since it uses less digits than its factorization.

21154414332 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2157802 (or 2157800 counting only the distinct ones).

The product of its digits is 11520, while the sum is 30.

Adding to 21154414332 its reverse (23341445112), we get a palindrome (44495859444).

The spelling of 21154414332 in words is "twenty-one billion, one hundred fifty-four million, four hundred fourteen thousand, three hundred thirty-two".