21212202021022 has 4 divisors (see below), whose sum is σ = 31818303031536. Its totient is φ = 10606101010510.

The previous prime is 21212202020993. The next prime is 21212202021071. The reversal of 21212202021022 is 22012020221212.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5303050505254 + ... + 5303050505257.

It is an arithmetic number, because the mean of its divisors is an integer number (7954575757884).

Almost surely, 2^{21212202021022} is an apocalyptic number.

21212202021022 is a deficient number, since it is larger than the sum of its proper divisors (10606101010514).

21212202021022 is a wasteful number, since it uses less digits than its factorization.

21212202021022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10606101010513.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 21212202021022 its reverse (22012020221212), we get a palindrome (43224222242234).

The spelling of 21212202021022 in words is "twenty-one trillion, two hundred twelve billion, two hundred two million, twenty-one thousand, twenty-two".