21021212112010 has 64 divisors (see below), whose sum is σ = 41759315631360. Its totient is φ = 7555324564480.

The previous prime is 21021212112001. The next prime is 21021212112011. The reversal of 21021212112010 is 1021121212012.

It is not an unprimeable number, because it can be changed into a prime (21021212112011) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2106984 + ... + 6817756.

It is an arithmetic number, because the mean of its divisors is an integer number (652489306740).

Almost surely, 2^{21021212112010} is an apocalyptic number.

21021212112010 is a deficient number, since it is larger than the sum of its proper divisors (20738103519350).

21021212112010 is a wasteful number, since it uses less digits than its factorization.

21021212112010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4711263.

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

Adding to 21021212112010 its reverse (1021121212012), we get a palindrome (22042333324022).

The spelling of 21021212112010 in words is "twenty-one trillion, twenty-one billion, two hundred twelve million, one hundred twelve thousand, ten".