21275123043135 has 32 divisors (see below), whose sum is σ = 36664973166528. Its totient is φ = 10472106839040.

The previous prime is 21275123043133. The next prime is 21275123043149. The reversal of 21275123043135 is 53134032157212.

It is not a de Polignac number, because 21275123043135 - 2¹ = 21275123043133 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a junction number, because it is equal to n+sod(n) for n = 21275123043093 and 21275123043102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21275123043133) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8236422 + ... + 10506611.

It is an arithmetic number, because the mean of its divisors is an integer number (1145780411454).

Almost surely, 2^{21275123043135} is an apocalyptic number.

21275123043135 is a deficient number, since it is larger than the sum of its proper divisors (15389850123393).

21275123043135 is a wasteful number, since it uses less digits than its factorization.

21275123043135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18748875.

The product of its (nonzero) digits is 151200, while the sum is 39.

The spelling of 21275123043135 in words is "twenty-one trillion, two hundred seventy-five billion, one hundred twenty-three million, forty-three thousand, one hundred thirty-five".