21011021212222 has 8 divisors (see below), whose sum is σ = 31522261071672. Its totient is φ = 10503600855000.

The previous prime is 21011021212211. The next prime is 21011021212231. The reversal of 21011021212222 is 22221212011012.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21011021212222.

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, 954861804 + ... + 954883807.

It is an arithmetic number, because the mean of its divisors is an integer number (3940282633959).

Almost surely, 2^{21011021212222} is an apocalyptic number.

21011021212222 is a deficient number, since it is larger than the sum of its proper divisors (10511239859450).

21011021212222 is a wasteful number, since it uses less digits than its factorization.

21011021212222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1909751114.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 21011021212222 its reverse (22221212011012), we get a palindrome (43232233223234).

The spelling of 21011021212222 in words is "twenty-one trillion, eleven billion, twenty-one million, two hundred twelve thousand, two hundred twenty-two".