21401325277 has 4 divisors (see below), whose sum is σ = 21899030560. Its totient is φ = 20903619996.

The previous prime is 21401325251. The next prime is 21401325287. The reversal of 21401325277 is 77252310412.

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 a cyclic number.

It is not a de Polignac number, because 21401325277 - 2⁷ = 21401325149 is a prime.

It is a super-2 number, since 2×21401325277² (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 (21401325287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 248852577 + ... + 248852662.

It is an arithmetic number, because the mean of its divisors is an integer number (5474757640).

Almost surely, 2^21401325277 is an apocalyptic number.

It is an amenable number.

21401325277 is a deficient number, since it is larger than the sum of its proper divisors (497705283).

21401325277 is an equidigital number, since it uses as much as digits as its factorization.

21401325277 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 497705282.

The product of its (nonzero) digits is 23520, while the sum is 34.

Adding to 21401325277 its reverse (77252310412), we get a palindrome (98653635689).

The spelling of 21401325277 in words is "twenty-one billion, four hundred one million, three hundred twenty-five thousand, two hundred seventy-seven".