21001120111010 has 64 divisors (see below), whose sum is σ = 43118084104704. Its totient is φ = 7295837260800.

The previous prime is 21001120111003. The next prime is 21001120111039. The reversal of 21001120111010 is 1011102110012.

It is a junction number, because it is equal to n+sod(n) for n = 21001120110982 and 21001120111000.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5563115 + ... + 8541105.

It is an arithmetic number, because the mean of its divisors is an integer number (673720064136).

Almost surely, 2^{21001120111010} is an apocalyptic number.

21001120111010 is an abundant number, since it is smaller than the sum of its proper divisors (22116963993694).

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

21001120111010 is a wasteful number, since it uses less digits than its factorization.

21001120111010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2981219.

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

Adding to 21001120111010 its reverse (1011102110012), we get a palindrome (22012222221022).

The spelling of 21001120111010 in words is "twenty-one trillion, one billion, one hundred twenty million, one hundred eleven thousand, ten".