21001012101210 has 16 divisors (see below), whose sum is σ = 50402429042976. Its totient is φ = 5600269893648.

The previous prime is 21001012101193. The next prime is 21001012101217. The reversal of 21001012101210 is 1210121010012.

It is not an unprimeable number, because it can be changed into a prime (21001012101217) by changing a digit.

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, 350016868324 + ... + 350016868383.

It is an arithmetic number, because the mean of its divisors is an integer number (3150151815186).

Almost surely, 2^{21001012101210} is an apocalyptic number.

21001012101210 is an abundant number, since it is smaller than the sum of its proper divisors (29401416941766).

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

21001012101210 is a wasteful number, since it uses less digits than its factorization.

21001012101210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 700033736717.

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

Adding to 21001012101210 its reverse (1210121010012), we get a palindrome (22211133111222).

The spelling of 21001012101210 in words is "twenty-one trillion, one billion, twelve million, one hundred one thousand, two hundred ten".