21222012031 has 16 divisors (see below), whose sum is σ = 23419036800. Its totient is φ = 19070244000.

The previous prime is 21222011969. The next prime is 21222012047. The reversal of 21222012031 is 13021022212.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21222012031 - 2¹⁹ = 21221487743 is a prime.

It is a super-2 number, since 2×21222012031² (a number of 21 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 = 21222011996 and 21222012014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21222012061) 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, 672280 + ... + 703138.

It is an arithmetic number, because the mean of its divisors is an integer number (1463689800).

Almost surely, 2^21222012031 is an apocalyptic number.

21222012031 is a deficient number, since it is larger than the sum of its proper divisors (2197024769).

21222012031 is a wasteful number, since it uses less digits than its factorization.

21222012031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31590.

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

Adding to 21222012031 its reverse (13021022212), we get a palindrome (34243034243).

The spelling of 21222012031 in words is "twenty-one billion, two hundred twenty-two million, twelve thousand, thirty-one".