21311426834 has 4 divisors (see below), whose sum is σ = 31967140254. Its totient is φ = 10655713416.

The previous prime is 21311426821. The next prime is 21311426887. The reversal of 21311426834 is 43862411312.

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., 11322024025 + 9989402809 = 106405^2 + 99947^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21311426794 and 21311426803.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5327856707 + ... + 5327856710.

Almost surely, 2^21311426834 is an apocalyptic number.

21311426834 is a deficient number, since it is larger than the sum of its proper divisors (10655713420).

21311426834 is a wasteful number, since it uses less digits than its factorization.

21311426834 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10655713419.

The product of its digits is 27648, while the sum is 35.

The spelling of 21311426834 in words is "twenty-one billion, three hundred eleven million, four hundred twenty-six thousand, eight hundred thirty-four".