21762213442 has 4 divisors (see below), whose sum is σ = 32643320166. Its totient is φ = 10881106720.

The previous prime is 21762213419. The next prime is 21762213443. The reversal of 21762213442 is 24431226712.

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., 19923604801 + 1838608641 = 141151^2 + 42879^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21762213398 and 21762213407.

It is not an unprimeable number, because it can be changed into a prime (21762213443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5440553359 + ... + 5440553362.

Almost surely, 2^21762213442 is an apocalyptic number.

21762213442 is a deficient number, since it is larger than the sum of its proper divisors (10881106724).

21762213442 is a wasteful number, since it uses less digits than its factorization.

21762213442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10881106723.

The product of its digits is 32256, while the sum is 34.

The spelling of 21762213442 in words is "twenty-one billion, seven hundred sixty-two million, two hundred thirteen thousand, four hundred forty-two".