21455445342135 has 64 divisors (see below), whose sum is σ = 39543717888000. Its totient is φ = 9730485459072.

The previous prime is 21455445342119. The next prime is 21455445342169. The reversal of 21455445342135 is 53124354455412.

It is a happy number.

It is not a de Polignac number, because 21455445342135 - 2⁴ = 21455445342119 is a prime.

It is a super-2 number, since 2×21455445342135² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 478690756 + ... + 478735574.

It is an arithmetic number, because the mean of its divisors is an integer number (617870592000).

Almost surely, 2^{21455445342135} is an apocalyptic number.

21455445342135 is a deficient number, since it is larger than the sum of its proper divisors (18088272545865).

21455445342135 is a wasteful number, since it uses less digits than its factorization.

21455445342135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80860.

The product of its digits is 5760000, while the sum is 48.

Adding to 21455445342135 its reverse (53124354455412), we get a palindrome (74579799797547).

The spelling of 21455445342135 in words is "twenty-one trillion, four hundred fifty-five billion, four hundred forty-five million, three hundred forty-two thousand, one hundred thirty-five".