21012200221210 has 32 divisors (see below), whose sum is σ = 41782602988800. Its totient is φ = 7544081088960.

The previous prime is 21012200221139. The next prime is 21012200221217. The reversal of 21012200221210 is 1212200221012.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21012200221217) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1208978665 + ... + 1208996044.

It is an arithmetic number, because the mean of its divisors is an integer number (1305706343400).

Almost surely, 2^{21012200221210} is an apocalyptic number.

21012200221210 is a deficient number, since it is larger than the sum of its proper divisors (20770402767590).

21012200221210 is a wasteful number, since it uses less digits than its factorization.

21012200221210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2417974806.

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

Adding to 21012200221210 its reverse (1212200221012), we get a palindrome (22224400442222).

The spelling of 21012200221210 in words is "twenty-one trillion, twelve billion, two hundred million, two hundred twenty-one thousand, two hundred ten".