21222212121210 has 32 divisors (see below), whose sum is σ = 50935493658240. Its totient is φ = 5659013835968.

The previous prime is 21222212121197. The next prime is 21222212121223. The reversal of 21222212121210 is 1212121222212.

It is an interprime number because it is at equal distance from previous prime (21222212121197) and next prime (21222212121223).

It is a Curzon 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 in 15 ways as a sum of consecutive naturals, for example, 14458950 + ... + 15858929.

It is an arithmetic number, because the mean of its divisors is an integer number (1591734176820).

Almost surely, 2^{21222212121210} is an apocalyptic number.

21222212121210 is an abundant number, since it is smaller than the sum of its proper divisors (29713281537030).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21222212121210 is a wasteful number, since it uses less digits than its factorization.

21222212121210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30341222.

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 21222212121210 its reverse (1212121222212), we get a palindrome (22434333343422).

The spelling of 21222212121210 in words is "twenty-one trillion, two hundred twenty-two billion, two hundred twelve million, one hundred twenty-one thousand, two hundred ten".