21421330002 has 48 divisors (see below), whose sum is σ = 48585858048. Its totient is φ = 6808127040.

The previous prime is 21421329997. The next prime is 21421330003. The reversal of 21421330002 is 20003312412.

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 (21421330003) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 46927 + ... + 212237.

It is an arithmetic number, because the mean of its divisors is an integer number (1012205376).

Almost surely, 2^21421330002 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21421330002, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24292929024).

21421330002 is an abundant number, since it is smaller than the sum of its proper divisors (27164528046).

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

21421330002 is a wasteful number, since it uses less digits than its factorization.

21421330002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165655 (or 165652 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 21421330002 its reverse (20003312412), we get a palindrome (41424642414).

The spelling of 21421330002 in words is "twenty-one billion, four hundred twenty-one million, three hundred thirty thousand, two".