1023112111221 has 24 divisors (see below), whose sum is σ = 1527128954624. Its totient is φ = 659367708480.

The previous prime is 1023112111213. The next prime is 1023112111291. The reversal of 1023112111221 is 1221112113201.

It is a happy number.

1023112111221 is a `hidden beast` number, since 1 + 0 + 231 + 1 + 211 + 1 + 221 = 666.

It is not a de Polignac number, because 1023112111221 - 2³ = 1023112111213 is a prime.

It is a super-2 number, since 2×1023112111221² (a number of 25 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 = 1023112111194 and 1023112111203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1023112111291) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1695391 + ... + 2218236.

Almost surely, 2^{1023112111221} is an apocalyptic number.

It is an amenable number.

1023112111221 is a deficient number, since it is larger than the sum of its proper divisors (504016843403).

1023112111221 is a wasteful number, since it uses less digits than its factorization.

1023112111221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3914601 (or 3914598 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 18.

Adding to 1023112111221 its reverse (1221112113201), we get a palindrome (2244224224422).

The spelling of 1023112111221 in words is "one trillion, twenty-three billion, one hundred twelve million, one hundred eleven thousand, two hundred twenty-one".