21001413040 has 20 divisors (see below), whose sum is σ = 48828285504. Its totient is φ = 8400565184.

The previous prime is 21001413011. The next prime is 21001413071. The reversal of 21001413040 is 4031410012.

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

It is a Harshad number since it is a multiple of its sum of digits (16).

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, 131258752 + ... + 131258911.

Almost surely, 2^21001413040 is an apocalyptic number.

21001413040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21001413040 is an abundant number, since it is smaller than the sum of its proper divisors (27826872464).

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

21001413040 is a wasteful number, since it uses less digits than its factorization.

21001413040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 262517676 (or 262517670 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 21001413040 its reverse (4031410012), we get a palindrome (25032823052).

The spelling of 21001413040 in words is "twenty-one billion, one million, four hundred thirteen thousand, forty".