21892697534 has 4 divisors (see below), whose sum is σ = 32839046304. Its totient is φ = 10946348766.

The previous prime is 21892697521. The next prime is 21892697549. The reversal of 21892697534 is 43579629812.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21892697534.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5473174382 + ... + 5473174385.

It is an arithmetic number, because the mean of its divisors is an integer number (8209761576).

Almost surely, 2^21892697534 is an apocalyptic number.

21892697534 is a deficient number, since it is larger than the sum of its proper divisors (10946348770).

21892697534 is a wasteful number, since it uses less digits than its factorization.

21892697534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10946348769.

The product of its digits is 6531840, while the sum is 56.

The spelling of 21892697534 in words is "twenty-one billion, eight hundred ninety-two million, six hundred ninety-seven thousand, five hundred thirty-four".