21021012011222 has 4 divisors (see below), whose sum is σ = 31531518016836. Its totient is φ = 10510506005610.

The previous prime is 21021012011183. The next prime is 21021012011249. The reversal of 21021012011222 is 22211021012012.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21021012011222.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5255253002804 + ... + 5255253002807.

It is an arithmetic number, because the mean of its divisors is an integer number (7882879504209).

Almost surely, 2^{21021012011222} is an apocalyptic number.

21021012011222 is a deficient number, since it is larger than the sum of its proper divisors (10510506005614).

21021012011222 is a wasteful number, since it uses less digits than its factorization.

21021012011222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10510506005613.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21021012011222 its reverse (22211021012012), we get a palindrome (43232033023234).

The spelling of 21021012011222 in words is "twenty-one trillion, twenty-one billion, twelve million, eleven thousand, two hundred twenty-two".