21506142673351 has 8 divisors (see below), whose sum is σ = 24614434790784. Its totient is φ = 18406847061240.

The previous prime is 21506142673271. The next prime is 21506142673357. The reversal of 21506142673351 is 15337624160512.

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 21506142673351 - 2²³ = 21506134284743 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 (21506142673357) 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, 2249121205 + ... + 2249130766.

It is an arithmetic number, because the mean of its divisors is an integer number (3076804348848).

Almost surely, 2^{21506142673351} is an apocalyptic number.

21506142673351 is a deficient number, since it is larger than the sum of its proper divisors (3108292117433).

21506142673351 is an equidigital number, since it uses as much as digits as its factorization.

21506142673351 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4498252661.

The product of its (nonzero) digits is 907200, while the sum is 46.

The spelling of 21506142673351 in words is "twenty-one trillion, five hundred six billion, one hundred forty-two million, six hundred seventy-three thousand, three hundred fifty-one".