21120221101210 has 128 divisors (see below), whose sum is σ = 50371700636160. Its totient is φ = 6172661760000.

The previous prime is 21120221101183. The next prime is 21120221101237. The reversal of 21120221101210 is 1210112202112.

It is an interprime number because it is at equal distance from previous prime (21120221101183) and next prime (21120221101237).

It is a super-2 number, since 2×21120221101210² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 522210 + ... + 6520210.

It is an arithmetic number, because the mean of its divisors is an integer number (393528911220).

Almost surely, 2^{21120221101210} is an apocalyptic number.

21120221101210 is an abundant number, since it is smaller than the sum of its proper divisors (29251479534950).

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

21120221101210 is a wasteful number, since it uses less digits than its factorization.

21120221101210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5998312.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21120221101210 its reverse (1210112202112), we get a palindrome (22330333303322).

The spelling of 21120221101210 in words is "twenty-one trillion, one hundred twenty billion, two hundred twenty-one million, one hundred one thousand, two hundred ten".