21010111001210 has 16 divisors (see below), whose sum is σ = 37832487042816. Its totient is φ = 8400869458128.

The previous prime is 21010111001203. The next prime is 21010111001213. The reversal of 21010111001210 is 1210011101012.

It is a junction number, because it is equal to n+sod(n) for n = 21010111001191 and 21010111001200.

It is not an unprimeable number, because it can be changed into a prime (21010111001213) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 396840002 + ... + 396892941.

It is an arithmetic number, because the mean of its divisors is an integer number (2364530440176).

Almost surely, 2^{21010111001210} is an apocalyptic number.

21010111001210 is a deficient number, since it is larger than the sum of its proper divisors (16822376041606).

21010111001210 is a wasteful number, since it uses less digits than its factorization.

21010111001210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 793735597.

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 21010111001210 its reverse (1210011101012), we get a palindrome (22220122102222).

The spelling of 21010111001210 in words is "twenty-one trillion, ten billion, one hundred eleven million, one thousand, two hundred ten".