9012100011221 has 4 divisors (see below), whose sum is σ = 9012106695552. Its totient is φ = 9012093326892.

The previous prime is 9012100011119. The next prime is 9012100011287. The reversal of 9012100011221 is 1221100012109.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 9012100011221 - 2¹⁴ = 9012099994837 is a prime.

It is a super-2 number, since 2×9012100011221² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 9012100011193 and 9012100011202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9012100011721) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 532421 + ... + 4278746.

It is an arithmetic number, because the mean of its divisors is an integer number (2253026673888).

Almost surely, 2^{9012100011221} is an apocalyptic number.

It is an amenable number.

9012100011221 is a deficient number, since it is larger than the sum of its proper divisors (6684331).

9012100011221 is a wasteful number, since it uses less digits than its factorization.

9012100011221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6684330.

The product of its (nonzero) digits is 72, while the sum is 20.

The spelling of 9012100011221 in words is "nine trillion, twelve billion, one hundred million, eleven thousand, two hundred twenty-one".