21211023133443 has 32 divisors (see below), whose sum is σ = 33232898829312. Its totient is φ = 11863720857600.

The previous prime is 21211023133423. The next prime is 21211023133451. The reversal of 21211023133443 is 34433132011212.

It is not a de Polignac number, because 21211023133443 - 2⁹ = 21211023132931 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21211023133443.

It is not an unprimeable number, because it can be changed into a prime (21211023133423) 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, 3415230 + ... + 7354307.

It is an arithmetic number, because the mean of its divisors is an integer number (1038528088416).

Almost surely, 2^{21211023133443} is an apocalyptic number.

21211023133443 is a deficient number, since it is larger than the sum of its proper divisors (12021875695869).

21211023133443 is a wasteful number, since it uses less digits than its factorization.

21211023133443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10774155.

The product of its (nonzero) digits is 10368, while the sum is 30.

Adding to 21211023133443 its reverse (34433132011212), we get a palindrome (55644155144655).

The spelling of 21211023133443 in words is "twenty-one trillion, two hundred eleven billion, twenty-three million, one hundred thirty-three thousand, four hundred forty-three".