21783562957 has 8 divisors (see below), whose sum is σ = 23473663136. Its totient is φ = 20095525872.

The previous prime is 21783562943. The next prime is 21783562963. The reversal of 21783562957 is 75926538712.

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 21783562957 - 2¹⁵ = 21783530189 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21783562898 and 21783562907.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21783562967) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 493803 + ... + 536104.

It is an arithmetic number, because the mean of its divisors is an integer number (2934207892).

Almost surely, 2^21783562957 is an apocalyptic number.

It is an amenable number.

21783562957 is a deficient number, since it is larger than the sum of its proper divisors (1690100179).

21783562957 is a wasteful number, since it uses less digits than its factorization.

21783562957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1031547.

The product of its digits is 6350400, while the sum is 55.

The spelling of 21783562957 in words is "twenty-one billion, seven hundred eighty-three million, five hundred sixty-two thousand, nine hundred fifty-seven".