21492078159 has 8 divisors (see below), whose sum is σ = 28934319232. Its totient is φ = 14188944600.

The previous prime is 21492078131. The next prime is 21492078187. The reversal of 21492078159 is 95187029412.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21492078131) and next prime (21492078187).

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

It is not a de Polignac number, because 21492078159 - 2¹³ = 21492069967 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 (21492078109) 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, 34776517 + ... + 34777134.

It is an arithmetic number, because the mean of its divisors is an integer number (3616789904).

Almost surely, 2^21492078159 is an apocalyptic number.

21492078159 is a deficient number, since it is larger than the sum of its proper divisors (7442241073).

21492078159 is a wasteful number, since it uses less digits than its factorization.

21492078159 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69553757.

The product of its (nonzero) digits is 362880, while the sum is 48.

The spelling of 21492078159 in words is "twenty-one billion, four hundred ninety-two million, seventy-eight thousand, one hundred fifty-nine".