21121210221222 has 32 divisors (see below), whose sum is σ = 42262674933600. Its totient is φ = 7037028016128.

The previous prime is 21121210221121. The next prime is 21121210221239. The reversal of 21121210221222 is 22212201212112.

It is a super-2 number, since 2×21121210221222² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 330974854 + ... + 331038662.

It is an arithmetic number, because the mean of its divisors is an integer number (1320708591675).

Almost surely, 2^{21121210221222} is an apocalyptic number.

21121210221222 is an abundant number, since it is smaller than the sum of its proper divisors (21141464712378).

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

21121210221222 is a wasteful number, since it uses less digits than its factorization.

21121210221222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89400.

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

Adding to 21121210221222 its reverse (22212201212112), we get a palindrome (43333411433334).

The spelling of 21121210221222 in words is "twenty-one trillion, one hundred twenty-one billion, two hundred ten million, two hundred twenty-one thousand, two hundred twenty-two".