21221113040 has 20 divisors (see below), whose sum is σ = 49339088004. Its totient is φ = 8488445184.

The previous prime is 21221113019. The next prime is 21221113061. The reversal of 21221113040 is 4031112212.

It is an interprime number because it is at equal distance from previous prime (21221113019) and next prime (21221113061).

It can be written as a sum of positive squares in 2 ways, for example, as 7516196416 + 13704916624 = 86696^2 + 117068^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

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, 132631877 + ... + 132632036.

Almost surely, 2^21221113040 is an apocalyptic number.

21221113040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21221113040 is an abundant number, since it is smaller than the sum of its proper divisors (28117974964).

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

21221113040 is a wasteful number, since it uses less digits than its factorization.

21221113040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 265263926 (or 265263920 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 21221113040 its reverse (4031112212), we get a palindrome (25252225252).

The spelling of 21221113040 in words is "twenty-one billion, two hundred twenty-one million, one hundred thirteen thousand, forty".