21122112221210 has 768 divisors, whose sum is σ = 55019621744640. Its totient is φ = 5634427392000.

The previous prime is 21122112221209. The next prime is 21122112221213. The reversal of 21122112221210 is 1212221122112.

It is a super-2 number, since 2×21122112221210² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21122112221213) by changing a digit.

It is a polite number, since it can be written in 383 ways as a sum of consecutive naturals, for example, 58835967011 + ... + 58835967369.

It is an arithmetic number, because the mean of its divisors is an integer number (71640132480).

Almost surely, 2^{21122112221210} is an apocalyptic number.

21122112221210 is an abundant number, since it is smaller than the sum of its proper divisors (33897509523430).

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

21122112221210 is a wasteful number, since it uses less digits than its factorization.

21122112221210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 755 (or 732 counting only the distinct ones).

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

Adding to 21122112221210 its reverse (1212221122112), we get a palindrome (22334333343322).

The spelling of 21122112221210 in words is "twenty-one trillion, one hundred twenty-two billion, one hundred twelve million, two hundred twenty-one thousand, two hundred ten".