21142817583 has 8 divisors (see below), whose sum is σ = 28302736896. Its totient is φ = 14039055000.

The previous prime is 21142817581. The next prime is 21142817593. The reversal of 21142817583 is 38571824112.

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

It is not a de Polignac number, because 21142817583 - 2¹ = 21142817581 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21142817581) 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, 14038303 + ... + 14039808.

It is an arithmetic number, because the mean of its divisors is an integer number (3537842112).

Almost surely, 2^21142817583 is an apocalyptic number.

21142817583 is a deficient number, since it is larger than the sum of its proper divisors (7159919313).

21142817583 is a wasteful number, since it uses less digits than its factorization.

21142817583 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28078365.

The product of its digits is 107520, while the sum is 42.

The spelling of 21142817583 in words is "twenty-one billion, one hundred forty-two million, eight hundred seventeen thousand, five hundred eighty-three".