21782406922 has 4 divisors (see below), whose sum is σ = 32673610386. Its totient is φ = 10891203460.

The previous prime is 21782406907. The next prime is 21782406923. The reversal of 21782406922 is 22960428712.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 17208454761 + 4573952161 = 131181^2 + 67631^2 .

It is not an unprimeable number, because it can be changed into a prime (21782406923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5445601729 + ... + 5445601732.

Almost surely, 2^21782406922 is an apocalyptic number.

21782406922 is a deficient number, since it is larger than the sum of its proper divisors (10891203464).

21782406922 is a wasteful number, since it uses less digits than its factorization.

21782406922 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10891203463.

The product of its (nonzero) digits is 193536, while the sum is 43.

The spelling of 21782406922 in words is "twenty-one billion, seven hundred eighty-two million, four hundred six thousand, nine hundred twenty-two".