21221222212010 has 16 divisors (see below), whose sum is σ = 38576399983272. Its totient is φ = 8404444440000.

The previous prime is 21221222212007. The next prime is 21221222212049. The reversal of 21221222212010 is 1021222212212.

It can be written as a sum of positive squares in 4 ways, for example, as 15643788979729 + 5577433232281 = 3955223^2 + 2361659^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10505554541 + ... + 10505556560.

Almost surely, 2^{21221222212010} is an apocalyptic number.

21221222212010 is a deficient number, since it is larger than the sum of its proper divisors (17355177771262).

21221222212010 is a wasteful number, since it uses less digits than its factorization.

21221222212010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21011111209.

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 21221222212010 its reverse (1021222212212), we get a palindrome (22242444424222).

The spelling of 21221222212010 in words is "twenty-one trillion, two hundred twenty-one billion, two hundred twenty-two million, two hundred twelve thousand, ten".