21620452146063 has 16 divisors (see below), whose sum is σ = 29457964638720. Its totient is φ = 14098648645376.

The previous prime is 21620452146037. The next prime is 21620452146077. The reversal of 21620452146063 is 36064125402612.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21620452146063 - 2²⁵ = 21620418591631 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21620452141063) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44939433 + ... + 45417986.

It is an arithmetic number, because the mean of its divisors is an integer number (1841122789920).

Almost surely, 2^{21620452146063} is an apocalyptic number.

21620452146063 is a deficient number, since it is larger than the sum of its proper divisors (7837512492657).

21620452146063 is a wasteful number, since it uses less digits than its factorization.

21620452146063 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90359166.

The product of its (nonzero) digits is 414720, while the sum is 42.

Adding to 21620452146063 its reverse (36064125402612), we get a palindrome (57684577548675).

The spelling of 21620452146063 in words is "twenty-one trillion, six hundred twenty billion, four hundred fifty-two million, one hundred forty-six thousand, sixty-three".