101012201221 has 2 divisors, whose sum is σ = 101012201222. Its totient is φ = 101012201220.

The previous prime is 101012201219. The next prime is 101012201291. The reversal of 101012201221 is 122102210101.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 97665000196 + 3347201025 = 312514^2 + 57855^2 .

It is a cyclic number.

It is not a de Polignac number, because 101012201221 - 2¹ = 101012201219 is a prime.

Together with 101012201219, 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 (101012201291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50506100610 + 50506100611.

It is an arithmetic number, because the mean of its divisors is an integer number (50506100611).

Almost surely, 2^101012201221 is an apocalyptic number.

It is an amenable number.

101012201221 is a deficient number, since it is larger than the sum of its proper divisors (1).

101012201221 is an equidigital number, since it uses as much as digits as its factorization.

101012201221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 101012201221 its reverse (122102210101), we get a palindrome (223114411322).

The spelling of 101012201221 in words is "one hundred one billion, twelve million, two hundred one thousand, two hundred twenty-one".