21892877401 has 4 divisors (see below), whose sum is σ = 21893363892. Its totient is φ = 21892390912.

The previous prime is 21892877371. The next prime is 21892877411. The reversal of 21892877401 is 10477829812.

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

It can be written as a sum of positive squares in 2 ways, for example, as 17507259225 + 4385618176 = 132315^2 + 66224^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21892877401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21892877411) 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, 167980 + ... + 268333.

It is an arithmetic number, because the mean of its divisors is an integer number (5473340973).

Almost surely, 2^21892877401 is an apocalyptic number.

It is an amenable number.

21892877401 is a deficient number, since it is larger than the sum of its proper divisors (486491).

21892877401 is an equidigital number, since it uses as much as digits as its factorization.

21892877401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 486490.

The product of its (nonzero) digits is 451584, while the sum is 49.

The spelling of 21892877401 in words is "twenty-one billion, eight hundred ninety-two million, eight hundred seventy-seven thousand, four hundred one".