21003220332 has 36 divisors (see below), whose sum is σ = 53126747856. Its totient is φ = 6996421920.

The previous prime is 21003220319. The next prime is 21003220351. The reversal of 21003220332 is 23302230012.

It is a happy number.

21003220332 is a `hidden beast` number, since 2 + 10 + 0 + 322 + 0 + 332 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×21003220332² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 138663 + ... + 247454.

It is an arithmetic number, because the mean of its divisors is an integer number (1475742996).

Almost surely, 2^21003220332 is an apocalyptic number.

It is an amenable number.

21003220332 is an abundant number, since it is smaller than the sum of its proper divisors (32123527524).

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

21003220332 is a wasteful number, since it uses less digits than its factorization.

21003220332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 387638 (or 387633 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 18.

Adding to 21003220332 its reverse (23302230012), we get a palindrome (44305450344).

The spelling of 21003220332 in words is "twenty-one billion, three million, two hundred twenty thousand, three hundred thirty-two".