21533435423355 has 32 divisors (see below), whose sum is σ = 35488216051200. Its totient is φ = 11143129939200.

The previous prime is 21533435423287. The next prime is 21533435423393. The reversal of 21533435423355 is 55332453433512.

It is not a de Polignac number, because 21533435423355 - 2¹¹ = 21533435421307 is a prime.

It is a super-2 number, since 2×21533435423355² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 110449530 + ... + 110644319.

It is an arithmetic number, because the mean of its divisors is an integer number (1109006751600).

Almost surely, 2^{21533435423355} is an apocalyptic number.

21533435423355 is a deficient number, since it is larger than the sum of its proper divisors (13954780627845).

21533435423355 is a wasteful number, since it uses less digits than its factorization.

21533435423355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221094051.

The product of its digits is 9720000, while the sum is 48.

Adding to 21533435423355 its reverse (55332453433512), we get a palindrome (76865888856867).

The spelling of 21533435423355 in words is "twenty-one trillion, five hundred thirty-three billion, four hundred thirty-five million, four hundred twenty-three thousand, three hundred fifty-five".