20121101021 has 8 divisors (see below), whose sum is σ = 23171083584. Its totient is φ = 17115003360.

The previous prime is 20121100991. The next prime is 20121101027. The reversal of 20121101021 is 12010112102.

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

It is not a de Polignac number, because 20121101021 - 2²⁶ = 20053992157 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20121100993 and 20121101011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20121101027) 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, 10970240 + ... + 10972073.

It is an arithmetic number, because the mean of its divisors is an integer number (2896385448).

Almost surely, 2^20121101021 is an apocalyptic number.

It is an amenable number.

20121101021 is a deficient number, since it is larger than the sum of its proper divisors (3049982563).

20121101021 is a wasteful number, since it uses less digits than its factorization.

20121101021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21942451.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 20121101021 its reverse (12010112102), we get a palindrome (32131213123).

The spelling of 20121101021 in words is "twenty billion, one hundred twenty-one million, one hundred one thousand, twenty-one".