21012121211222 has 16 divisors (see below), whose sum is σ = 31696020057600. Its totient is φ = 10446787707240.

The previous prime is 21012121211161. The next prime is 21012121211231. The reversal of 21012121211222 is 22211212121012.

It is a junction number, because it is equal to n+sod(n) for n = 21012121211194 and 21012121211203.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4866947 + ... + 8106257.

It is an arithmetic number, because the mean of its divisors is an integer number (1981001253600).

Almost surely, 2^{21012121211222} is an apocalyptic number.

21012121211222 is a deficient number, since it is larger than the sum of its proper divisors (10683898846378).

21012121211222 is a wasteful number, since it uses less digits than its factorization.

21012121211222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3257611.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 21012121211222 its reverse (22211212121012), we get a palindrome (43223333332234).

The spelling of 21012121211222 in words is "twenty-one trillion, twelve billion, one hundred twenty-one million, two hundred eleven thousand, two hundred twenty-two".