21002223042 has 24 divisors (see below), whose sum is σ = 45508620144. Its totient is φ = 7000155864.

The previous prime is 21002223041. The next prime is 21002223043. The reversal of 21002223042 is 24032220012.

It is an interprime number because it is at equal distance from previous prime (21002223041) and next prime (21002223043).

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 (21002223041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 209553 + ... + 293115.

It is an arithmetic number, because the mean of its divisors is an integer number (1896192506).

Almost surely, 2^21002223042 is an apocalyptic number.

21002223042 is an abundant number, since it is smaller than the sum of its proper divisors (24506397102).

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

21002223042 is a wasteful number, since it uses less digits than its factorization.

21002223042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97534 (or 97531 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

Adding to 21002223042 its reverse (24032220012), we get a palindrome (45034443054).

The spelling of 21002223042 in words is "twenty-one billion, two million, two hundred twenty-three thousand, forty-two".