21132254320405 has 8 divisors (see below), whose sum is σ = 25362496330200. Its totient is φ = 16903276025856.

The previous prime is 21132254320393. The next prime is 21132254320417. The reversal of 21132254320405 is 50402345223112.

It is an interprime number because it is at equal distance from previous prime (21132254320393) and next prime (21132254320417).

It can be written as a sum of positive squares in 4 ways, for example, as 3981996304036 + 17150258016369 = 1995494^2 + 4141287^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21132254320405 - 2¹⁹ = 21132253796117 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 315892020 + ... + 315958909.

It is an arithmetic number, because the mean of its divisors is an integer number (3170312041275).

Almost surely, 2^{21132254320405} is an apocalyptic number.

It is an amenable number.

21132254320405 is a deficient number, since it is larger than the sum of its proper divisors (4230242009795).

21132254320405 is an equidigital number, since it uses as much as digits as its factorization.

21132254320405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 631857623.

The product of its (nonzero) digits is 57600, while the sum is 34.

Adding to 21132254320405 its reverse (50402345223112), we get a palindrome (71534599543517).

The spelling of 21132254320405 in words is "twenty-one trillion, one hundred thirty-two billion, two hundred fifty-four million, three hundred twenty thousand, four hundred five".