212201120021 has 4 divisors (see below), whose sum is σ = 231492130944. Its totient is φ = 192910109100.

The previous prime is 212201119979. The next prime is 212201120101. The reversal of 212201120021 is 120021102212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212201120021 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 212201119978 and 212201120005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212201120221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9645505445 + ... + 9645505466.

It is an arithmetic number, because the mean of its divisors is an integer number (57873032736).

Almost surely, 2^212201120021 is an apocalyptic number.

It is an amenable number.

212201120021 is a deficient number, since it is larger than the sum of its proper divisors (19291010923).

212201120021 is a wasteful number, since it uses less digits than its factorization.

212201120021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19291010922.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 212201120021 its reverse (120021102212), we get a palindrome (332222222233).

The spelling of 212201120021 in words is "two hundred twelve billion, two hundred one million, one hundred twenty thousand, twenty-one".