21002223140 has 48 divisors (see below), whose sum is σ = 44888887344. Its totient is φ = 8251891200.

The previous prime is 21002223101. The next prime is 21002223149. The reversal of 21002223140 is 4132220012.

It can be written as a sum of positive squares in 8 ways, for example, as 5932696576 + 15069526564 = 77024^2 + 122758^2 .

It is not an unprimeable number, because it can be changed into a prime (21002223149) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 912170 + ... + 934910.

It is an arithmetic number, because the mean of its divisors is an integer number (935185153).

Almost surely, 2^21002223140 is an apocalyptic number.

21002223140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21002223140 is an abundant number, since it is smaller than the sum of its proper divisors (23886664204).

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

21002223140 is a wasteful number, since it uses less digits than its factorization.

21002223140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23568 (or 23566 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 17.

Adding to 21002223140 its reverse (4132220012), we get a palindrome (25134443152).

The spelling of 21002223140 in words is "twenty-one billion, two million, two hundred twenty-three thousand, one hundred forty".