21012101211010 has 128 divisors (see below), whose sum is σ = 48582862110720. Its totient is φ = 6359666455296.

The previous prime is 21012101211007. The next prime is 21012101211029. The reversal of 21012101211010 is 1011210121012.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 115421719 + ... + 115603621.

It is an arithmetic number, because the mean of its divisors is an integer number (379553610240).

Almost surely, 2^{21012101211010} is an apocalyptic number.

21012101211010 is an abundant number, since it is smaller than the sum of its proper divisors (27570760899710).

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

21012101211010 is a wasteful number, since it uses less digits than its factorization.

21012101211010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187472.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 21012101211010 its reverse (1011210121012), we get a palindrome (22023311332022).

The spelling of 21012101211010 in words is "twenty-one trillion, twelve billion, one hundred one million, two hundred eleven thousand, ten".