21001330422 has 24 divisors (see below), whose sum is σ = 45505682976. Its totient is φ = 7000012656.

The previous prime is 21001330387. The next prime is 21001330453. The reversal of 21001330422 is 22403310012.

21001330422 is a `hidden beast` number, since 210 + 0 + 1 + 3 + 30 + 422 = 666.

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

It is a junction number, because it is equal to n+sod(n) for n = 21001330395 and 21001330404.

It is a congruent number.

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, 423768 + ... + 470724.

It is an arithmetic number, because the mean of its divisors is an integer number (1896070124).

Almost surely, 2^21001330422 is an apocalyptic number.

21001330422 is an abundant number, since it is smaller than the sum of its proper divisors (24504352554).

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

21001330422 is a wasteful number, since it uses less digits than its factorization.

21001330422 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71812 (or 71809 counting only the distinct ones).

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

Adding to 21001330422 its reverse (22403310012), we get a palindrome (43404640434).

The spelling of 21001330422 in words is "twenty-one billion, one million, three hundred thirty thousand, four hundred twenty-two".