21333000402 has 128 divisors (see below), whose sum is σ = 55261440000. Its totient is φ = 5974001856.

The previous prime is 21333000323. The next prime is 21333000407. The reversal of 21333000402 is 20400033312.

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

It is not an unprimeable number, because it can be changed into a prime (21333000407) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 8674249 + ... + 8676707.

It is an arithmetic number, because the mean of its divisors is an integer number (431730000).

Almost surely, 2^21333000402 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21333000402, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27630720000).

21333000402 is an abundant number, since it is smaller than the sum of its proper divisors (33928439598).

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

21333000402 is a wasteful number, since it uses less digits than its factorization.

21333000402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2925 (or 2919 counting only the distinct ones).

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

Adding to 21333000402 its reverse (20400033312), we get a palindrome (41733033714).

The spelling of 21333000402 in words is "twenty-one billion, three hundred thirty-three million, four hundred two", and thus it is an aban number.