21025196877 has 4 divisors (see below), whose sum is σ = 28033595840. Its totient is φ = 14016797916.

The previous prime is 21025196873. The next prime is 21025196917. The reversal of 21025196877 is 77869152012.

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 not a de Polignac number, because 21025196877 - 2² = 21025196873 is a prime.

It is a super-2 number, since 2×21025196877² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21025196873) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 3504199477 + ... + 3504199482.

It is an arithmetic number, because the mean of its divisors is an integer number (7008398960).

Almost surely, 2^21025196877 is an apocalyptic number.

It is an amenable number.

21025196877 is a deficient number, since it is larger than the sum of its proper divisors (7008398963).

21025196877 is an equidigital number, since it uses as much as digits as its factorization.

21025196877 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7008398962.

The product of its (nonzero) digits is 423360, while the sum is 48.

The spelling of 21025196877 in words is "twenty-one billion, twenty-five million, one hundred ninety-six thousand, eight hundred seventy-seven".