21044200429 has 4 divisors (see below), whose sum is σ = 24050514784. Its totient is φ = 18037886076.

The previous prime is 21044200427. The next prime is 21044200477. The reversal of 21044200429 is 92400244012.

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 21044200429 - 2¹ = 21044200427 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21044200397 and 21044200406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21044200423) 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, 1503157167 + ... + 1503157180.

It is an arithmetic number, because the mean of its divisors is an integer number (6012628696).

Almost surely, 2^21044200429 is an apocalyptic number.

It is an amenable number.

21044200429 is a deficient number, since it is larger than the sum of its proper divisors (3006314355).

21044200429 is an equidigital number, since it uses as much as digits as its factorization.

21044200429 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3006314354.

The product of its (nonzero) digits is 4608, while the sum is 28.

The spelling of 21044200429 in words is "twenty-one billion, forty-four million, two hundred thousand, four hundred twenty-nine".