221021022031 has 2 divisors, whose sum is σ = 221021022032. Its totient is φ = 221021022030.

The previous prime is 221021022007. The next prime is 221021022077. The reversal of 221021022031 is 130220120122.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221021022031 - 2¹⁹ = 221020497743 is a prime.

It is a super-2 number, since 2×221021022031² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 221021021996 and 221021022014.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221021022731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110510511015 + 110510511016.

It is an arithmetic number, because the mean of its divisors is an integer number (110510511016).

Almost surely, 2^221021022031 is an apocalyptic number.

221021022031 is a deficient number, since it is larger than the sum of its proper divisors (1).

221021022031 is an equidigital number, since it uses as much as digits as its factorization.

221021022031 is an evil number, because the sum of its binary digits is even.

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

Adding to 221021022031 its reverse (130220120122), we get a palindrome (351241142153).

The spelling of 221021022031 in words is "two hundred twenty-one billion, twenty-one million, twenty-two thousand, thirty-one".