21254192877 has 4 divisors (see below), whose sum is σ = 28338923840. Its totient is φ = 14169461916.

The previous prime is 21254192873. The next prime is 21254192881. The reversal of 21254192877 is 77829145212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (21254192873) and next prime (21254192881).

It is not a de Polignac number, because 21254192877 - 2² = 21254192873 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21254192873) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3542365477 + ... + 3542365482.

It is an arithmetic number, because the mean of its divisors is an integer number (7084730960).

Almost surely, 2^21254192877 is an apocalyptic number.

It is an amenable number.

21254192877 is a deficient number, since it is larger than the sum of its proper divisors (7084730963).

21254192877 is an equidigital number, since it uses as much as digits as its factorization.

21254192877 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7084730962.

The product of its digits is 564480, while the sum is 48.

The spelling of 21254192877 in words is "twenty-one billion, two hundred fifty-four million, one hundred ninety-two thousand, eight hundred seventy-seven".