21144213110552 has 32 divisors (see below), whose sum is σ = 47693713785600. Its totient is φ = 8584868480544.

The previous prime is 21144213110551. The next prime is 21144213110623. The reversal of 21144213110552 is 25501131244112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21144213110551) 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, 9936189308 + ... + 9936191435.

It is an arithmetic number, because the mean of its divisors is an integer number (1490428555800).

Almost surely, 2^{21144213110552} is an apocalyptic number.

It is an amenable number.

21144213110552 is an abundant number, since it is smaller than the sum of its proper divisors (26549500675048).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21144213110552 is a wasteful number, since it uses less digits than its factorization.

21144213110552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19872380775 (or 19872380771 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 32.

Adding to 21144213110552 its reverse (25501131244112), we get a palindrome (46645344354664).

The spelling of 21144213110552 in words is "twenty-one trillion, one hundred forty-four billion, two hundred thirteen million, one hundred ten thousand, five hundred fifty-two".