21152542222443 has 8 divisors (see below), whose sum is σ = 28211287541056. Its totient is φ = 14097745859400.

The previous prime is 21152542222411. The next prime is 21152542222447. The reversal of 21152542222443 is 34422224525112.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21152542222443 - 2⁵ = 21152542222411 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21152542222447) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 987226393 + ... + 987247818.

It is an arithmetic number, because the mean of its divisors is an integer number (3526410942632).

Almost surely, 2^{21152542222443} is an apocalyptic number.

21152542222443 is a deficient number, since it is larger than the sum of its proper divisors (7058745318613).

21152542222443 is a wasteful number, since it uses less digits than its factorization.

21152542222443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1974477785.

The product of its digits is 307200, while the sum is 39.

Adding to 21152542222443 its reverse (34422224525112), we get a palindrome (55574766747555).

The spelling of 21152542222443 in words is "twenty-one trillion, one hundred fifty-two billion, five hundred forty-two million, two hundred twenty-two thousand, four hundred forty-three".