1822012210021 has 2 divisors, whose sum is σ = 1822012210022. Its totient is φ = 1822012210020.

The previous prime is 1822012210019. The next prime is 1822012210033. The reversal of 1822012210021 is 1200122102281.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1219067724996 + 602944485025 = 1104114^2 + 776495^2 .

It is an emirp because it is prime and its reverse (1200122102281) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1822012210021 - 2¹ = 1822012210019 is a prime.

It is a super-2 number, since 2×1822012210021² (a number of 25 digits) contains 22 as substring.

Together with 1822012210019, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 1822012209974 and 1822012210001.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1822012210091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 911006105010 + 911006105011.

It is an arithmetic number, because the mean of its divisors is an integer number (911006105011).

Almost surely, 2^{1822012210021} is an apocalyptic number.

It is an amenable number.

1822012210021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1822012210021 is an equidigital number, since it uses as much as digits as its factorization.

1822012210021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 256, while the sum is 22.

The spelling of 1822012210021 in words is "one trillion, eight hundred twenty-two billion, twelve million, two hundred ten thousand, twenty-one".