101621606221 has 2 divisors, whose sum is σ = 101621606222. Its totient is φ = 101621606220.

The previous prime is 101621606209. The next prime is 101621606239. The reversal of 101621606221 is 122606126101.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 101242330596 + 379275625 = 318186^2 + 19475^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-101621606221 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 101621606221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (101621606291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50810803110 + 50810803111.

It is an arithmetic number, because the mean of its divisors is an integer number (50810803111).

Almost surely, 2^101621606221 is an apocalyptic number.

It is an amenable number.

101621606221 is a deficient number, since it is larger than the sum of its proper divisors (1).

101621606221 is an equidigital number, since it uses as much as digits as its factorization.

101621606221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 28.

The spelling of 101621606221 in words is "one hundred one billion, six hundred twenty-one million, six hundred six thousand, two hundred twenty-one".