212100022012221 has 64 divisors (see below), whose sum is σ = 367586295408640. Its totient is φ = 118341548519040.

The previous prime is 212100022012199. The next prime is 212100022012303. The reversal of 212100022012221 is 122210220001212.

It is a happy number.

212100022012221 is a `hidden beast` number, since 2 + 1 + 210 + 0 + 0 + 220 + 12 + 221 = 666.

It is not a de Polignac number, because 212100022012221 - 2⁵ = 212100022012189 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 212100022012194 and 212100022012203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212100022012121) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 19753161 + ... + 28537473.

It is an arithmetic number, because the mean of its divisors is an integer number (5743535865760).

Almost surely, 2^{212100022012221} is an apocalyptic number.

212100022012221 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

212100022012221 is a deficient number, since it is larger than the sum of its proper divisors (155486273396419).

212100022012221 is a wasteful number, since it uses less digits than its factorization.

212100022012221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8787343 (or 8787337 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 212100022012221 its reverse (122210220001212), we get a palindrome (334310242013433).

The spelling of 212100022012221 in words is "two hundred twelve trillion, one hundred billion, twenty-two million, twelve thousand, two hundred twenty-one".