100021212112221 has 12 divisors (see below), whose sum is σ = 148379816166972. Its totient is φ = 64878624072576.

The previous prime is 100021212112201. The next prime is 100021212112247. The reversal of 100021212112221 is 122211212120001.

100021212112221 is a `hidden beast` number, since 100 + 0 + 21 + 212 + 112 + 221 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 94320244083321 + 5700968028900 = 9711861^2 + 2387670^2 .

It is not a de Polignac number, because 100021212112221 - 2⁷ = 100021212112093 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 100021212112194 and 100021212112203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100021212112201) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 150181999836 + ... + 150182000501.

It is an arithmetic number, because the mean of its divisors is an integer number (12364984680581).

Almost surely, 2^{100021212112221} is an apocalyptic number.

It is an amenable number.

100021212112221 is a deficient number, since it is larger than the sum of its proper divisors (48358604054751).

100021212112221 is a wasteful number, since it uses less digits than its factorization.

100021212112221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 300364000380 (or 300364000377 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 100021212112221 its reverse (122211212120001), we get a palindrome (222232424232222).

The spelling of 100021212112221 in words is "one hundred trillion, twenty-one billion, two hundred twelve million, one hundred twelve thousand, two hundred twenty-one".