21132421041 has 4 divisors (see below), whose sum is σ = 28176561392. Its totient is φ = 14088280692.

The previous prime is 21132421039. The next prime is 21132421049. The reversal of 21132421041 is 14012423112.

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 21132421041 - 2¹ = 21132421039 is a prime.

It is a super-3 number, since 3×21132421041³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21132420999 and 21132421017.

It is not an unprimeable number, because it can be changed into a prime (21132421049) 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, 3522070171 + ... + 3522070176.

It is an arithmetic number, because the mean of its divisors is an integer number (7044140348).

Almost surely, 2^21132421041 is an apocalyptic number.

It is an amenable number.

21132421041 is a deficient number, since it is larger than the sum of its proper divisors (7044140351).

21132421041 is an equidigital number, since it uses as much as digits as its factorization.

21132421041 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7044140350.

The product of its (nonzero) digits is 384, while the sum is 21.

Adding to 21132421041 its reverse (14012423112), we get a palindrome (35144844153).

The spelling of 21132421041 in words is "twenty-one billion, one hundred thirty-two million, four hundred twenty-one thousand, forty-one".