21333421104 has 160 divisors (see below), whose sum is σ = 59090217984. Its totient is φ = 6615797760.

The previous prime is 21333421093. The next prime is 21333421111. The reversal of 21333421104 is 40112433312.

It is a happy number.

It is a super-2 number, since 2×21333421104² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 22767324 + ... + 22768260.

Almost surely, 2^21333421104 is an apocalyptic number.

21333421104 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21333421104, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29545108992).

21333421104 is an abundant number, since it is smaller than the sum of its proper divisors (37756796880).

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

21333421104 is a wasteful number, since it uses less digits than its factorization.

21333421104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1515 (or 1509 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 24.

Adding to 21333421104 its reverse (40112433312), we get a palindrome (61445854416).

The spelling of 21333421104 in words is "twenty-one billion, three hundred thirty-three million, four hundred twenty-one thousand, one hundred four".