212442032021 has 2 divisors, whose sum is σ = 212442032022. Its totient is φ = 212442032020.

The previous prime is 212442032009. The next prime is 212442032041. The reversal of 212442032021 is 120230244212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 156455847025 + 55986184996 = 395545^2 + 236614^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212442032021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212442032041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106221016010 + 106221016011.

It is an arithmetic number, because the mean of its divisors is an integer number (106221016011).

Almost surely, 2^212442032021 is an apocalyptic number.

It is an amenable number.

212442032021 is a deficient number, since it is larger than the sum of its proper divisors (1).

212442032021 is an equidigital number, since it uses as much as digits as its factorization.

212442032021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1536, while the sum is 23.

Adding to 212442032021 its reverse (120230244212), we get a palindrome (332672276233).

The spelling of 212442032021 in words is "two hundred twelve billion, four hundred forty-two million, thirty-two thousand, twenty-one".