21111033321031 has 4 divisors (see below), whose sum is σ = 21211085611864. Its totient is φ = 21010981030200.

The previous prime is 21111033321019. The next prime is 21111033321107. The reversal of 21111033321031 is 13012333011112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21111033321031 is a prime.

It is a super-2 number, since 2×21111033321031² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21111033320993 and 21111033321011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21111013321031) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50026145100 + ... + 50026145521.

It is an arithmetic number, because the mean of its divisors is an integer number (5302771402966).

Almost surely, 2^{21111033321031} is an apocalyptic number.

21111033321031 is a deficient number, since it is larger than the sum of its proper divisors (100052290833).

21111033321031 is a wasteful number, since it uses less digits than its factorization.

21111033321031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100052290832.

The product of its (nonzero) digits is 324, while the sum is 22.

Adding to 21111033321031 its reverse (13012333011112), we get a palindrome (34123366332143).

The spelling of 21111033321031 in words is "twenty-one trillion, one hundred eleven billion, thirty-three million, three hundred twenty-one thousand, thirty-one".