21220021331123 has 16 divisors (see below), whose sum is σ = 22665327302400. Its totient is φ = 19822605949440.

The previous prime is 21220021331077. The next prime is 21220021331143. The reversal of 21220021331123 is 32113312002212.

It is a cyclic number.

It is not a de Polignac number, because 21220021331123 - 2⁸ = 21220021330867 is a prime.

It is a super-2 number, since 2×21220021331123² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21220021331143) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 891743 + ... + 6575351.

It is an arithmetic number, because the mean of its divisors is an integer number (1416582956400).

Almost surely, 2^{21220021331123} is an apocalyptic number.

21220021331123 is a deficient number, since it is larger than the sum of its proper divisors (1445305971277).

21220021331123 is a wasteful number, since it uses less digits than its factorization.

21220021331123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5687822.

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 21220021331123 its reverse (32113312002212), we get a palindrome (53333333333335).

The spelling of 21220021331123 in words is "twenty-one trillion, two hundred twenty billion, twenty-one million, three hundred thirty-one thousand, one hundred twenty-three".