21120220021210 has 64 divisors (see below), whose sum is σ = 40801904174592. Its totient is φ = 7857782424576.

The previous prime is 21120220021129. The next prime is 21120220021297. The reversal of 21120220021210 is 1212002202112.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13374367 + ... + 14869906.

It is an arithmetic number, because the mean of its divisors is an integer number (637529752728).

Almost surely, 2^{21120220021210} is an apocalyptic number.

21120220021210 is a deficient number, since it is larger than the sum of its proper divisors (19681684153382).

21120220021210 is a wasteful number, since it uses less digits than its factorization.

21120220021210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28244407.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21120220021210 its reverse (1212002202112), we get a palindrome (22332222223322).

The spelling of 21120220021210 in words is "twenty-one trillion, one hundred twenty billion, two hundred twenty million, twenty-one thousand, two hundred ten".