21877029743 has 4 divisors (see below), whose sum is σ = 21879649680. Its totient is φ = 21874409808.

The previous prime is 21877029721. The next prime is 21877029767. The reversal of 21877029743 is 34792077812.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 21877029743 - 2⁶ = 21877029679 is a prime.

It is a super-2 number, since 2×21877029743² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21877029691 and 21877029700.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21877029143) 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, 1297403 + ... + 1314156.

It is an arithmetic number, because the mean of its divisors is an integer number (5469912420).

Almost surely, 2^21877029743 is an apocalyptic number.

21877029743 is a deficient number, since it is larger than the sum of its proper divisors (2619937).

21877029743 is an equidigital number, since it uses as much as digits as its factorization.

21877029743 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2619936.

The product of its (nonzero) digits is 1185408, while the sum is 50.

The spelling of 21877029743 in words is "twenty-one billion, eight hundred seventy-seven million, twenty-nine thousand, seven hundred forty-three".