21141030440 has 16 divisors (see below), whose sum is σ = 47567318580. Its totient is φ = 8456412160.

The previous prime is 21141030397. The next prime is 21141030517. The reversal of 21141030440 is 4403014112.

It can be written as a sum of positive squares in 2 ways, for example, as 19520001796 + 1621028644 = 139714^2 + 40262^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 264262841 + ... + 264262920.

Almost surely, 2^21141030440 is an apocalyptic number.

21141030440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21141030440 is an abundant number, since it is smaller than the sum of its proper divisors (26426288140).

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

21141030440 is a wasteful number, since it uses less digits than its factorization.

21141030440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 528525772 (or 528525768 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 21141030440 its reverse (4403014112), we get a palindrome (25544044552).

The spelling of 21141030440 in words is "twenty-one billion, one hundred forty-one million, thirty thousand, four hundred forty".