21783295412 has 6 divisors (see below), whose sum is σ = 38120766978. Its totient is φ = 10891647704.

The previous prime is 21783295379. The next prime is 21783295441. The reversal of 21783295412 is 21459238712.

It can be written as a sum of positive squares in only one way, i.e., 17539294096 + 4244001316 = 132436^2 + 65146^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2722911923 + ... + 2722911930.

It is an arithmetic number, because the mean of its divisors is an integer number (6353461163).

Almost surely, 2^21783295412 is an apocalyptic number.

It is an amenable number.

21783295412 is a deficient number, since it is larger than the sum of its proper divisors (16337471566).

21783295412 is a wasteful number, since it uses less digits than its factorization.

21783295412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5445823857 (or 5445823855 counting only the distinct ones).

The product of its digits is 241920, while the sum is 44.

The spelling of 21783295412 in words is "twenty-one billion, seven hundred eighty-three million, two hundred ninety-five thousand, four hundred twelve".