21852021683 has 4 divisors (see below), whose sum is σ = 21873594288. Its totient is φ = 21830449080.

The previous prime is 21852021661. The next prime is 21852021713. The reversal of 21852021683 is 38612025812.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21852021683 - 2¹² = 21852017587 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21852026683) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10784783 + ... + 10786808.

It is an arithmetic number, because the mean of its divisors is an integer number (5468398572).

Almost surely, 2^21852021683 is an apocalyptic number.

21852021683 is a deficient number, since it is larger than the sum of its proper divisors (21572605).

21852021683 is a wasteful number, since it uses less digits than its factorization.

21852021683 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21572604.

The product of its (nonzero) digits is 46080, while the sum is 38.

The spelling of 21852021683 in words is "twenty-one billion, eight hundred fifty-two million, twenty-one thousand, six hundred eighty-three".