21403415811 has 32 divisors (see below), whose sum is σ = 30185568000. Its totient is φ = 13452566400.

The previous prime is 21403415741. The next prime is 21403415819. The reversal of 21403415811 is 11851430412.

It is not a de Polignac number, because 21403415811 - 2²⁵ = 21369861379 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21403415819) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16450861 + ... + 16452161.

It is an arithmetic number, because the mean of its divisors is an integer number (943299000).

Almost surely, 2^21403415811 is an apocalyptic number.

21403415811 is a deficient number, since it is larger than the sum of its proper divisors (8782152189).

21403415811 is a wasteful number, since it uses less digits than its factorization.

21403415811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2499.

The product of its (nonzero) digits is 3840, while the sum is 30.

The spelling of 21403415811 in words is "twenty-one billion, four hundred three million, four hundred fifteen thousand, eight hundred eleven".