21450035212553 has 16 divisors (see below), whose sum is σ = 22814792501760. Its totient is φ = 20096730398976.

The previous prime is 21450035212523. The next prime is 21450035212561. The reversal of 21450035212553 is 35521253005412.

It is a cyclic number.

It is not a de Polignac number, because 21450035212553 - 2¹⁶ = 21450035147017 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21450035212523) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 81705263 + ... + 81967371.

It is an arithmetic number, because the mean of its divisors is an integer number (1425924531360).

Almost surely, 2^{21450035212553} is an apocalyptic number.

It is an amenable number.

21450035212553 is a deficient number, since it is larger than the sum of its proper divisors (1364757289207).

21450035212553 is a wasteful number, since it uses less digits than its factorization.

21450035212553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 283936.

The product of its (nonzero) digits is 180000, while the sum is 38.

Adding to 21450035212553 its reverse (35521253005412), we get a palindrome (56971288217965).

The spelling of 21450035212553 in words is "twenty-one trillion, four hundred fifty billion, thirty-five million, two hundred twelve thousand, five hundred fifty-three".