21455503613435 has 32 divisors (see below), whose sum is σ = 26368252859520. Its totient is φ = 16753342814208.

The previous prime is 21455503613431. The next prime is 21455503613497. The reversal of 21455503613435 is 53431630555412.

It is a cyclic number.

It is not a de Polignac number, because 21455503613435 - 2² = 21455503613431 is a prime.

It is a super-2 number, since 2×21455503613435² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21455503613435.

It is not an unprimeable number, because it can be changed into a prime (21455503613431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 799401746 + ... + 799428584.

It is an arithmetic number, because the mean of its divisors is an integer number (824007901860).

Almost surely, 2^{21455503613435} is an apocalyptic number.

21455503613435 is a deficient number, since it is larger than the sum of its proper divisors (4912749246085).

21455503613435 is a wasteful number, since it uses less digits than its factorization.

21455503613435 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42407.

The product of its (nonzero) digits is 3240000, while the sum is 47.

The spelling of 21455503613435 in words is "twenty-one trillion, four hundred fifty-five billion, five hundred three million, six hundred thirteen thousand, four hundred thirty-five".