21889134867 has 16 divisors (see below), whose sum is σ = 29314599840. Its totient is φ = 14528274432.

The previous prime is 21889134863. The next prime is 21889134877. The reversal of 21889134867 is 76843198812.

It is not a de Polignac number, because 21889134867 - 2² = 21889134863 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21889134863) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1699809 + ... + 1712637.

It is an arithmetic number, because the mean of its divisors is an integer number (1832162490).

Almost surely, 2^21889134867 is an apocalyptic number.

21889134867 is a deficient number, since it is larger than the sum of its proper divisors (7425464973).

21889134867 is a wasteful number, since it uses less digits than its factorization.

21889134867 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15302.

The product of its digits is 4644864, while the sum is 57.

The spelling of 21889134867 in words is "twenty-one billion, eight hundred eighty-nine million, one hundred thirty-four thousand, eight hundred sixty-seven".