21046458399 has 8 divisors (see below), whose sum is σ = 28229980800. Its totient is φ = 13946954136.

The previous prime is 21046458397. The next prime is 21046458443. The reversal of 21046458399 is 99385464012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21046458399 - 2¹ = 21046458397 is a prime.

It is a super-2 number, since 2×21046458399² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21046458397) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21003949 + ... + 21004950.

It is an arithmetic number, because the mean of its divisors is an integer number (3528747600).

Almost surely, 2^21046458399 is an apocalyptic number.

21046458399 is a deficient number, since it is larger than the sum of its proper divisors (7183522401).

21046458399 is a wasteful number, since it uses less digits than its factorization.

21046458399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42009069.

The product of its (nonzero) digits is 1866240, while the sum is 51.

The spelling of 21046458399 in words is "twenty-one billion, forty-six million, four hundred fifty-eight thousand, three hundred ninety-nine".