21326277842 has 4 divisors (see below), whose sum is σ = 31989416766. Its totient is φ = 10663138920.

The previous prime is 21326277779. The next prime is 21326277851. The reversal of 21326277842 is 24877262312.

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., 18705759361 + 2620518481 = 136769^2 + 51191^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21326277793 and 21326277802.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5331569459 + ... + 5331569462.

Almost surely, 2^21326277842 is an apocalyptic number.

21326277842 is a deficient number, since it is larger than the sum of its proper divisors (10663138924).

21326277842 is a wasteful number, since it uses less digits than its factorization.

21326277842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10663138923.

The product of its digits is 451584, while the sum is 44.

The spelling of 21326277842 in words is "twenty-one billion, three hundred twenty-six million, two hundred seventy-seven thousand, eight hundred forty-two".