21002214042 has 48 divisors (see below), whose sum is σ = 45640288512. Its totient is φ = 6979932960.

The previous prime is 21002214029. The next prime is 21002214049. The reversal of 21002214042 is 24041220012.

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 (21002214049) 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, 13068403 + ... + 13070009.

It is an arithmetic number, because the mean of its divisors is an integer number (950839344).

Almost surely, 2^21002214042 is an apocalyptic number.

21002214042 is an abundant number, since it is smaller than the sum of its proper divisors (24638074470).

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

21002214042 is a wasteful number, since it uses less digits than its factorization.

21002214042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3323 (or 3320 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

Adding to 21002214042 its reverse (24041220012), we get a palindrome (45043434054).

The spelling of 21002214042 in words is "twenty-one billion, two million, two hundred fourteen thousand, forty-two".