21420310332 has 24 divisors (see below), whose sum is σ = 49984207056. Its totient is φ = 7139605888.

The previous prime is 21420310319. The next prime is 21420310399. The reversal of 21420310332 is 23301302412.

It is a junction number, because it is equal to n+sod(n) for n = 21420310299 and 21420310308.

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, 144718 + ... + 252554.

It is an arithmetic number, because the mean of its divisors is an integer number (2082675294).

Almost surely, 2^21420310332 is an apocalyptic number.

It is an amenable number.

21420310332 is an abundant number, since it is smaller than the sum of its proper divisors (28563896724).

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

21420310332 is a wasteful number, since it uses less digits than its factorization.

21420310332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124397 (or 124395 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 21.

Adding to 21420310332 its reverse (23301302412), we get a palindrome (44721612744).

The spelling of 21420310332 in words is "twenty-one billion, four hundred twenty million, three hundred ten thousand, three hundred thirty-two".