2223121021 has 12 divisors (see below), whose sum is σ = 2448184732. Its totient is φ = 2017224000.

The previous prime is 2223121013. The next prime is 2223121031. The reversal of 2223121021 is 1201213222.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 424936996 + 1798184025 = 20614^2 + 42405^2 .

It is not a de Polignac number, because 2223121021 - 2³ = 2223121013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2223120986 and 2223121004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2223121001) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 48481 + ... + 82441.

Almost surely, 2^2223121021 is an apocalyptic number.

It is an amenable number.

2223121021 is a deficient number, since it is larger than the sum of its proper divisors (225063711).

2223121021 is a wasteful number, since it uses less digits than its factorization.

2223121021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34524 (or 34513 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 2223121021 is about 47149.9843160101. The cubic root of 2223121021 is about 1305.1317905881.

Adding to 2223121021 its reverse (1201213222), we get a palindrome (3424334243).

The spelling of 2223121021 in words is "two billion, two hundred twenty-three million, one hundred twenty-one thousand, twenty-one".