20121211101021 has 8 divisors (see below), whose sum is σ = 27206144587584. Its totient is φ = 13225209174240.

The previous prime is 20121211100981. The next prime is 20121211101059. The reversal of 20121211101021 is 12010111212102.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20121211101021 - 2¹¹ = 20121211098973 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20121211101091) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47232889696 + ... + 47232890121.

It is an arithmetic number, because the mean of its divisors is an integer number (3400768073448).

Almost surely, 2^{20121211101021} is an apocalyptic number.

It is an amenable number.

20121211101021 is a deficient number, since it is larger than the sum of its proper divisors (7084933486563).

20121211101021 is an equidigital number, since it uses as much as digits as its factorization.

20121211101021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94465779891.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 20121211101021 its reverse (12010111212102), we get a palindrome (32131322313123).

The spelling of 20121211101021 in words is "twenty trillion, one hundred twenty-one billion, two hundred eleven million, one hundred one thousand, twenty-one".