212011021221122 has 4 divisors (see below), whose sum is σ = 318016531831686. Its totient is φ = 106005510610560.

The previous prime is 212011021221121. The next prime is 212011021221151. The reversal of 212011021221122 is 221122120110212.

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

It can be written as a sum of positive squares in only one way, i.e., 147717260902201 + 64293760318921 = 12153899^2 + 8018339^2 .

It is a junction number, because it is equal to n+sod(n) for n = 212011021221094 and 212011021221103.

It is not an unprimeable number, because it can be changed into a prime (212011021221121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 53002755305279 + ... + 53002755305282.

Almost surely, 2^{212011021221122} is an apocalyptic number.

212011021221122 is a deficient number, since it is larger than the sum of its proper divisors (106005510610564).

212011021221122 is a wasteful number, since it uses less digits than its factorization.

212011021221122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106005510610563.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 212011021221122 its reverse (221122120110212), we get a palindrome (433133141331334).

The spelling of 212011021221122 in words is "two hundred twelve trillion, eleven billion, twenty-one million, two hundred twenty-one thousand, one hundred twenty-two".