21232430741 has 4 divisors (see below), whose sum is σ = 21240571500. Its totient is φ = 21224289984.

The previous prime is 21232430729. The next prime is 21232430761. The reversal of 21232430741 is 14703423212.

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 14050546225 + 7181884516 = 118535^2 + 84746^2 .

It is a cyclic number.

It is not a de Polignac number, because 21232430741 - 2¹⁰ = 21232429717 is a prime.

It is a super-2 number, since 2×21232430741² (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 (21232430761) 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, 4066466 + ... + 4071683.

It is an arithmetic number, because the mean of its divisors is an integer number (5310142875).

Almost surely, 2^21232430741 is an apocalyptic number.

It is an amenable number.

21232430741 is a deficient number, since it is larger than the sum of its proper divisors (8140759).

21232430741 is an equidigital number, since it uses as much as digits as its factorization.

21232430741 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8140758.

The product of its (nonzero) digits is 8064, while the sum is 29.

Adding to 21232430741 its reverse (14703423212), we get a palindrome (35935853953).

The spelling of 21232430741 in words is "twenty-one billion, two hundred thirty-two million, four hundred thirty thousand, seven hundred forty-one".