21101143443 has 32 divisors (see below), whose sum is σ = 29826451200. Its totient is φ = 13232419200.

The previous prime is 21101143387. The next prime is 21101143493. The reversal of 21101143443 is 34434110112.

It is not a de Polignac number, because 21101143443 - 2⁶ = 21101143379 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21101143493) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8861113 + ... + 8863493.

It is an arithmetic number, because the mean of its divisors is an integer number (932076600).

Almost surely, 2^21101143443 is an apocalyptic number.

21101143443 is a deficient number, since it is larger than the sum of its proper divisors (8725307757).

21101143443 is a wasteful number, since it uses less digits than its factorization.

21101143443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3443.

The product of its (nonzero) digits is 1152, while the sum is 24.

Adding to 21101143443 its reverse (34434110112), we get a palindrome (55535253555).

The spelling of 21101143443 in words is "twenty-one billion, one hundred one million, one hundred forty-three thousand, four hundred forty-three".