21213441040 has 40 divisors (see below), whose sum is σ = 53805002688. Its totient is φ = 7713978240.

The previous prime is 21213441037. The next prime is 21213441047. The reversal of 21213441040 is 4014431212.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (22).

It is not an unprimeable number, because it can be changed into a prime (21213441047) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12052212 + ... + 12053971.

Almost surely, 2^21213441040 is an apocalyptic number.

21213441040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21213441040 is an abundant number, since it is smaller than the sum of its proper divisors (32591561648).

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

21213441040 is a wasteful number, since it uses less digits than its factorization.

21213441040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24106207 (or 24106201 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 22.

Adding to 21213441040 its reverse (4014431212), we get a palindrome (25227872252).

The spelling of 21213441040 in words is "twenty-one billion, two hundred thirteen million, four hundred forty-one thousand, forty".