21211120100001 has 16 divisors (see below), whose sum is σ = 30457392045696. Its totient is φ = 13052825949696.

The previous prime is 21211120099979. The next prime is 21211120100017. The reversal of 21211120100001 is 10000102111212.

It is not a de Polignac number, because 21211120100001 - 2⁶ = 21211120099937 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21211120100001.

It is not an unprimeable number, because it can be changed into a prime (21211120100021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 515685 + ... + 6533618.

It is an arithmetic number, because the mean of its divisors is an integer number (1903587002856).

Almost surely, 2^{21211120100001} is an apocalyptic number.

It is an amenable number.

21211120100001 is a deficient number, since it is larger than the sum of its proper divisors (9246271945695).

21211120100001 is a wasteful number, since it uses less digits than its factorization.

21211120100001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7126472.

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

Adding to 21211120100001 its reverse (10000102111212), we get a palindrome (31211222211213).

The spelling of 21211120100001 in words is "twenty-one trillion, two hundred eleven billion, one hundred twenty million, one hundred thousand, one".