21002121211222 has 8 divisors (see below), whose sum is σ = 31696452871416. Its totient is φ = 10436636920752.

The previous prime is 21002121211189. The next prime is 21002121211249. The reversal of 21002121211222 is 22211212120012.

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

It is a super-2 number, since 2×21002121211222² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21002121211222.

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, 32211842023 + ... + 32211842674.

It is an arithmetic number, because the mean of its divisors is an integer number (3962056608927).

Almost surely, 2^{21002121211222} is an apocalyptic number.

21002121211222 is a deficient number, since it is larger than the sum of its proper divisors (10694331660194).

21002121211222 is a wasteful number, since it uses less digits than its factorization.

21002121211222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64423684862.

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

Adding to 21002121211222 its reverse (22211212120012), we get a palindrome (43213333331234).

The spelling of 21002121211222 in words is "twenty-one trillion, two billion, one hundred twenty-one million, two hundred eleven thousand, two hundred twenty-two".