1012210021 has 2 divisors, whose sum is σ = 1012210022. Its totient is φ = 1012210020.

The previous prime is 1012210019. The next prime is 1012210033. The reversal of 1012210021 is 1200122101.

1012210021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 661209796 + 351000225 = 25714^2 + 18735^2 .

It is a cyclic number.

It is not a de Polignac number, because 1012210021 - 2¹ = 1012210019 is a prime.

It is a super-2 number, since 2×1012210021² = 2049138253225640882, which contains 22 as substring.

Together with 1012210019, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1012210061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 506105010 + 506105011.

It is an arithmetic number, because the mean of its divisors is an integer number (506105011).

Almost surely, 2^1012210021 is an apocalyptic number.

It is an amenable number.

1012210021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1012210021 is an equidigital number, since it uses as much as digits as its factorization.

1012210021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 1012210021 is about 31815.2482467134. The cubic root of 1012210021 is about 1004.0535535023.

Adding to 1012210021 its reverse (1200122101), we get a palindrome (2212332122).

It can be divided in two parts, 101 and 2210021, that added together give a palindrome (2210122).

The spelling of 1012210021 in words is "one billion, twelve million, two hundred ten thousand, twenty-one".