21121220000001 has 64 divisors (see below), whose sum is σ = 31328181319680. Its totient is φ = 12550132224000.

The previous prime is 21121219999963. The next prime is 21121220000003. The reversal of 21121220000001 is 10000002212112.

It is not a de Polignac number, because 21121220000001 - 2⁶ = 21121219999937 is a prime.

It is a super-2 number, since 2×21121220000001² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21121220000003) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1384173510 + ... + 1384188768.

It is an arithmetic number, because the mean of its divisors is an integer number (489502833120).

Almost surely, 2^{21121220000001} is an apocalyptic number.

It is an amenable number.

21121220000001 is a deficient number, since it is larger than the sum of its proper divisors (10206961319679).

21121220000001 is a wasteful number, since it uses less digits than its factorization.

21121220000001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18598.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21121220000001 its reverse (10000002212112), we get a palindrome (31121222212113).

The spelling of 21121220000001 in words is "twenty-one trillion, one hundred twenty-one billion, two hundred twenty million, one", and thus it is an aban number.