21430751829 has 4 divisors (see below), whose sum is σ = 28574335776. Its totient is φ = 14287167884.

The previous prime is 21430751827. The next prime is 21430751843. The reversal of 21430751829 is 92815703412.

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 21430751829 - 2¹ = 21430751827 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21430751827) 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, 3571791969 + ... + 3571791974.

It is an arithmetic number, because the mean of its divisors is an integer number (7143583944).

Almost surely, 2^21430751829 is an apocalyptic number.

It is an amenable number.

21430751829 is a deficient number, since it is larger than the sum of its proper divisors (7143583947).

21430751829 is an equidigital number, since it uses as much as digits as its factorization.

21430751829 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7143583946.

The product of its (nonzero) digits is 120960, while the sum is 42.

The spelling of 21430751829 in words is "twenty-one billion, four hundred thirty million, seven hundred fifty-one thousand, eight hundred twenty-nine".