21011100120010 has 128 divisors (see below), whose sum is σ = 50786036066304. Its totient is φ = 6044346696960.

The previous prime is 21011100119993. The next prime is 21011100120047. The reversal of 21011100120010 is 1002100111012.

It is a Harshad number since it is a multiple of its sum of digits (10).

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, 77171337 + ... + 77443123.

It is an arithmetic number, because the mean of its divisors is an integer number (396765906768).

Almost surely, 2^{21011100120010} is an apocalyptic number.

21011100120010 is an abundant number, since it is smaller than the sum of its proper divisors (29774935946294).

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

21011100120010 is a wasteful number, since it uses less digits than its factorization.

21011100120010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 279548.

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 21011100120010 its reverse (1002100111012), we get a palindrome (22013200231022).

The spelling of 21011100120010 in words is "twenty-one trillion, eleven billion, one hundred million, one hundred twenty thousand, ten".