2231221211021 has 16 divisors (see below), whose sum is σ = 2518290613440. Its totient is φ = 1958206884480.

The previous prime is 2231221210997. The next prime is 2231221211041. The reversal of 2231221211021 is 1201121221322.

It is not a de Polignac number, because 2231221211021 - 2¹⁴ = 2231221194637 is a prime.

It is a super-3 number, since 3×2231221211021³ (a number of 38 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2231221210984 and 2231221211002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2231221211041) 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, 2313650 + ... + 3132956.

It is an arithmetic number, because the mean of its divisors is an integer number (157393163340).

Almost surely, 2^{2231221211021} is an apocalyptic number.

It is an amenable number.

2231221211021 is a deficient number, since it is larger than the sum of its proper divisors (287069402419).

2231221211021 is a wasteful number, since it uses less digits than its factorization.

2231221211021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 827884.

The product of its (nonzero) digits is 192, while the sum is 20.

Adding to 2231221211021 its reverse (1201121221322), we get a palindrome (3432342432343).

The spelling of 2231221211021 in words is "two trillion, two hundred thirty-one billion, two hundred twenty-one million, two hundred eleven thousand, twenty-one".