2012020120021 has 2 divisors, whose sum is σ = 2012020120022. Its totient is φ = 2012020120020.

The previous prime is 2012020120003. The next prime is 2012020120073. The reversal of 2012020120021 is 1200210202102.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1703729772900 + 308290347121 = 1305270^2 + 555239^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2012020120021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2012020119983 and 2012020120010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2012020120091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1006010060010 + 1006010060011.

It is an arithmetic number, because the mean of its divisors is an integer number (1006010060011).

Almost surely, 2^{2012020120021} is an apocalyptic number.

It is an amenable number.

2012020120021 is a deficient number, since it is larger than the sum of its proper divisors (1).

2012020120021 is an equidigital number, since it uses as much as digits as its factorization.

2012020120021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 2012020120021 its reverse (1200210202102), we get a palindrome (3212230322123).

The spelling of 2012020120021 in words is "two trillion, twelve billion, twenty million, one hundred twenty thousand, twenty-one".