21212122122022 has 8 divisors (see below), whose sum is σ = 34265735735616. Its totient is φ = 9790210210152.

The previous prime is 21212122122007. The next prime is 21212122122031. The reversal of 21212122122022 is 22022122121212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 21212122121984 and 21212122122002.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 407925425398 + ... + 407925425449.

It is an arithmetic number, because the mean of its divisors is an integer number (4283216966952).

Almost surely, 2^{21212122122022} is an apocalyptic number.

21212122122022 is a deficient number, since it is larger than the sum of its proper divisors (13053613613594).

21212122122022 is a wasteful number, since it uses less digits than its factorization.

21212122122022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 815850850862.

The product of its (nonzero) digits is 512, while the sum is 22.

Adding to 21212122122022 its reverse (22022122121212), we get a palindrome (43234244243234).

The spelling of 21212122122022 in words is "twenty-one trillion, two hundred twelve billion, one hundred twenty-two million, one hundred twenty-two thousand, twenty-two".