102010012121221 has 2 divisors, whose sum is σ = 102010012121222. Its totient is φ = 102010012121220.

The previous prime is 102010012121191. The next prime is 102010012121231. The reversal of 102010012121221 is 122121210010201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 71878366128321 + 30131645992900 = 8478111^2 + 5489230^2 .

It is an emirp because it is prime and its reverse (122121210010201) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 102010012121221 - 2⁵ = 102010012121189 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 102010012121195 and 102010012121204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102010012121231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51005006060610 + 51005006060611.

It is an arithmetic number, because the mean of its divisors is an integer number (51005006060611).

Almost surely, 2^{102010012121221} is an apocalyptic number.

It is an amenable number.

102010012121221 is a deficient number, since it is larger than the sum of its proper divisors (1).

102010012121221 is an equidigital number, since it uses as much as digits as its factorization.

102010012121221 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 16.

Adding to 102010012121221 its reverse (122121210010201), we get a palindrome (224131222131422).

The spelling of 102010012121221 in words is "one hundred two trillion, ten billion, twelve million, one hundred twenty-one thousand, two hundred twenty-one".