21020212210022 has 4 divisors (see below), whose sum is σ = 31530318315036. Its totient is φ = 10510106105010.

The previous prime is 21020212210001. The next prime is 21020212210027. The reversal of 21020212210022 is 22001221202012.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21020212210027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5255053052504 + ... + 5255053052507.

It is an arithmetic number, because the mean of its divisors is an integer number (7882579578759).

Almost surely, 2^{21020212210022} is an apocalyptic number.

21020212210022 is a deficient number, since it is larger than the sum of its proper divisors (10510106105014).

21020212210022 is a wasteful number, since it uses less digits than its factorization.

21020212210022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10510106105013.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 21020212210022 its reverse (22001221202012), we get a palindrome (43021433412034).

The spelling of 21020212210022 in words is "twenty-one trillion, twenty billion, two hundred twelve million, two hundred ten thousand, twenty-two".