21232253783 has 4 divisors (see below), whose sum is σ = 22865504088. Its totient is φ = 19599003480.

The previous prime is 21232253737. The next prime is 21232253851. The reversal of 21232253783 is 38735223212.

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 21232253783 - 2⁶ = 21232253719 is a prime.

It is a super-2 number, since 2×21232253783² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21232253083) 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, 816625133 + ... + 816625158.

It is an arithmetic number, because the mean of its divisors is an integer number (5716376022).

Almost surely, 2^21232253783 is an apocalyptic number.

21232253783 is a deficient number, since it is larger than the sum of its proper divisors (1633250305).

21232253783 is a wasteful number, since it uses less digits than its factorization.

21232253783 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1633250304.

The product of its digits is 120960, while the sum is 38.

Adding to 21232253783 its reverse (38735223212), we get a palindrome (59967476995).

The spelling of 21232253783 in words is "twenty-one billion, two hundred thirty-two million, two hundred fifty-three thousand, seven hundred eighty-three".