20120021021 has 8 divisors (see below), whose sum is σ = 20164541184. Its totient is φ = 20075544720.

The previous prime is 20120020993. The next prime is 20120021023. The reversal of 20120021021 is 12012002102.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 20120021021 - 2¹⁸ = 20119758877 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20120020993 and 20120021011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20120021023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1010060 + ... + 1029786.

It is an arithmetic number, because the mean of its divisors is an integer number (2520567648).

Almost surely, 2^20120021021 is an apocalyptic number.

It is an amenable number.

20120021021 is a deficient number, since it is larger than the sum of its proper divisors (44520163).

20120021021 is a wasteful number, since it uses less digits than its factorization.

20120021021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21931.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 20120021021 its reverse (12012002102), we get a palindrome (32132023123).

The spelling of 20120021021 in words is "twenty billion, one hundred twenty million, twenty-one thousand, twenty-one".