21423206162399 has 16 divisors (see below), whose sum is σ = 22324814453760. Its totient is φ = 20535445399680.

The previous prime is 21423206162381. The next prime is 21423206162401. The reversal of 21423206162399 is 99326160232412.

It is a cyclic number.

It is not a de Polignac number, because 21423206162399 - 2⁸ = 21423206162143 is a prime.

It is a super-3 number, since 3×21423206162399³ (a number of 41 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21423206162299) 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, 3875237 + ... + 7606830.

It is an arithmetic number, because the mean of its divisors is an integer number (1395300903360).

Almost surely, 2^{21423206162399} is an apocalyptic number.

21423206162399 is a deficient number, since it is larger than the sum of its proper divisors (901608291361).

21423206162399 is a wasteful number, since it uses less digits than its factorization.

21423206162399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11482670.

The product of its (nonzero) digits is 1679616, while the sum is 50.

The spelling of 21423206162399 in words is "twenty-one trillion, four hundred twenty-three billion, two hundred six million, one hundred sixty-two thousand, three hundred ninety-nine".