21402817373 has 8 divisors (see below), whose sum is σ = 24470402880. Its totient is φ = 18337741920.

The previous prime is 21402817363. The next prime is 21402817393. The reversal of 21402817373 is 37371820412.

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

It is a cyclic number.

It is not a de Polignac number, because 21402817373 - 2⁶ = 21402817309 is a prime.

It is a super-2 number, since 2×21402817373² (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 (21402817333) 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, 609203 + ... + 643376.

It is an arithmetic number, because the mean of its divisors is an integer number (3058800360).

Almost surely, 2^21402817373 is an apocalyptic number.

It is an amenable number.

21402817373 is a deficient number, since it is larger than the sum of its proper divisors (3067585507).

21402817373 is a wasteful number, since it uses less digits than its factorization.

21402817373 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1255027.

The product of its (nonzero) digits is 56448, while the sum is 38.

The spelling of 21402817373 in words is "twenty-one billion, four hundred two million, eight hundred seventeen thousand, three hundred seventy-three".