21210110001210 has 128 divisors (see below), whose sum is σ = 57260909422080. Its totient is φ = 4991976170496.

The previous prime is 21210110001193. The next prime is 21210110001229. The reversal of 21210110001210 is 1210001101212.

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, 7938669 + ... + 10268528.

It is an arithmetic number, because the mean of its divisors is an integer number (447350854860).

Almost surely, 2^{21210110001210} is an apocalyptic number.

21210110001210 is an abundant number, since it is smaller than the sum of its proper divisors (36050799420870).

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

21210110001210 is a wasteful number, since it uses less digits than its factorization.

21210110001210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18207352.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 21210110001210 its reverse (1210001101212), we get a palindrome (22420111102422).

The spelling of 21210110001210 in words is "twenty-one trillion, two hundred ten billion, one hundred ten million, one thousand, two hundred ten".