21111552433213 has 8 divisors (see below), whose sum is σ = 23051778819840. Its totient is φ = 19174825104480.

The previous prime is 21111552433201. The next prime is 21111552433217. The reversal of 21111552433213 is 31233425511112.

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

It is a cyclic number.

It is not a de Polignac number, because 21111552433213 - 2³⁷ = 20974113479741 is a prime.

It is a super-2 number, since 2×21111552433213² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21111552433217) 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, 874751853 + ... + 874775986.

It is an arithmetic number, because the mean of its divisors is an integer number (2881472352480).

Almost surely, 2^{21111552433213} is an apocalyptic number.

It is an amenable number.

21111552433213 is a deficient number, since it is larger than the sum of its proper divisors (1940226386627).

21111552433213 is a wasteful number, since it uses less digits than its factorization.

21111552433213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1749528947.

The product of its digits is 21600, while the sum is 34.

Adding to 21111552433213 its reverse (31233425511112), we get a palindrome (52344977944325).

The spelling of 21111552433213 in words is "twenty-one trillion, one hundred eleven billion, five hundred fifty-two million, four hundred thirty-three thousand, two hundred thirteen".