21405150413 has 16 divisors (see below), whose sum is σ = 22288637952. Its totient is φ = 20534310000.

The previous prime is 21405150391. The next prime is 21405150427. The reversal of 21405150413 is 31405150412.

It is a cyclic number.

It is not a de Polignac number, because 21405150413 - 2²⁸ = 21136714957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21405150433) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2349998 + ... + 2359088.

It is an arithmetic number, because the mean of its divisors is an integer number (1393039872).

Almost surely, 2^21405150413 is an apocalyptic number.

It is an amenable number.

21405150413 is a deficient number, since it is larger than the sum of its proper divisors (883487539).

21405150413 is a wasteful number, since it uses less digits than its factorization.

21405150413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9776.

The product of its (nonzero) digits is 2400, while the sum is 26.

Subtracting 21405150413 from its reverse (31405150412), we obtain a palindrome (9999999999).

The spelling of 21405150413 in words is "twenty-one billion, four hundred five million, one hundred fifty thousand, four hundred thirteen".