221202021031 has 2 divisors, whose sum is σ = 221202021032. Its totient is φ = 221202021030.

The previous prime is 221202020993. The next prime is 221202021041. The reversal of 221202021031 is 130120202122.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221202021031 - 2⁷ = 221202020903 is a prime.

It is a super-2 number, since 2×221202021031² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 221202020996 and 221202021014.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221202021041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110601010515 + 110601010516.

It is an arithmetic number, because the mean of its divisors is an integer number (110601010516).

Almost surely, 2^221202021031 is an apocalyptic number.

221202021031 is a deficient number, since it is larger than the sum of its proper divisors (1).

221202021031 is an equidigital number, since it uses as much as digits as its factorization.

221202021031 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 221202021031 its reverse (130120202122), we get a palindrome (351322223153).

The spelling of 221202021031 in words is "two hundred twenty-one billion, two hundred two million, twenty-one thousand, thirty-one".