212021220101 has 4 divisors (see below), whose sum is σ = 214120440204. Its totient is φ = 209922000000.

The previous prime is 212021220043. The next prime is 212021220119. The reversal of 212021220101 is 101022120212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 208657104100 + 3364116001 = 456790^2 + 58001^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212021220101 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212021220121) 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, 1049609900 + ... + 1049610101.

It is an arithmetic number, because the mean of its divisors is an integer number (53530110051).

Almost surely, 2^212021220101 is an apocalyptic number.

It is an amenable number.

212021220101 is a deficient number, since it is larger than the sum of its proper divisors (2099220103).

212021220101 is a wasteful number, since it uses less digits than its factorization.

212021220101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2099220102.

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

Adding to 212021220101 its reverse (101022120212), we get a palindrome (313043340313).

The spelling of 212021220101 in words is "two hundred twelve billion, twenty-one million, two hundred twenty thousand, one hundred one".