21132420303 has 4 divisors (see below), whose sum is σ = 28176560408. Its totient is φ = 14088280200.

The previous prime is 21132420301. The next prime is 21132420311. The reversal of 21132420303 is 30302423112.

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

It is not a de Polignac number, because 21132420303 - 2¹ = 21132420301 is a prime.

It is a super-3 number, since 3×21132420303³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21132420303.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21132420301) 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, 3522070048 + ... + 3522070053.

It is an arithmetic number, because the mean of its divisors is an integer number (7044140102).

Almost surely, 2^21132420303 is an apocalyptic number.

21132420303 is a deficient number, since it is larger than the sum of its proper divisors (7044140105).

21132420303 is an equidigital number, since it uses as much as digits as its factorization.

21132420303 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7044140104.

The product of its (nonzero) digits is 864, while the sum is 21.

Adding to 21132420303 its reverse (30302423112), we get a palindrome (51434843415).

The spelling of 21132420303 in words is "twenty-one billion, one hundred thirty-two million, four hundred twenty thousand, three hundred three".