100121222021221 has 2 divisors, whose sum is σ = 100121222021222. Its totient is φ = 100121222021220.

The previous prime is 100121222021201. The next prime is 100121222021251. The reversal of 100121222021221 is 122120222121001.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 76939019277121 + 23182202744100 = 8771489^2 + 4814790^2 .

It is a cyclic number.

It is not a de Polignac number, because 100121222021221 - 2¹⁵ = 100121221988453 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (100121222021201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50060611010610 + 50060611010611.

It is an arithmetic number, because the mean of its divisors is an integer number (50060611010611).

Almost surely, 2^{100121222021221} is an apocalyptic number.

It is an amenable number.

100121222021221 is a deficient number, since it is larger than the sum of its proper divisors (1).

100121222021221 is an equidigital number, since it uses as much as digits as its factorization.

100121222021221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 100121222021221 its reverse (122120222121001), we get a palindrome (222241444142222).

The spelling of 100121222021221 in words is "one hundred trillion, one hundred twenty-one billion, two hundred twenty-two million, twenty-one thousand, two hundred twenty-one".