100021221999949 has 2 divisors, whose sum is σ = 100021221999950. Its totient is φ = 100021221999948.

The previous prime is 100021221999947. The next prime is 100021222000009. The reversal of 100021221999949 is 949999122120001.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 88249584515625 + 11771637484324 = 9394125^2 + 3430982^2 .

It is a cyclic number.

It is not a de Polignac number, because 100021221999949 - 2¹ = 100021221999947 is a prime.

Together with 100021221999947, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 100021221999893 and 100021221999902.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (100021221999947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50010610999974 + 50010610999975.

It is an arithmetic number, because the mean of its divisors is an integer number (50010610999975).

Almost surely, 2^{100021221999949} is an apocalyptic number.

It is an amenable number.

100021221999949 is a deficient number, since it is larger than the sum of its proper divisors (1).

100021221999949 is an equidigital number, since it uses as much as digits as its factorization.

100021221999949 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1889568, while the sum is 58.

The spelling of 100021221999949 in words is "one hundred trillion, twenty-one billion, two hundred twenty-one million, nine hundred ninety-nine thousand, nine hundred forty-nine".