20101212021 has 32 divisors (see below), whose sum is σ = 30091387392. Its totient is φ = 11830311360.

The previous prime is 20101211971. The next prime is 20101212023. The reversal of 20101212021 is 12021210102.

It is not a de Polignac number, because 20101212021 - 2¹⁷ = 20101080949 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20101211988 and 20101212006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20101212023) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 204546 + ... + 286428.

It is an arithmetic number, because the mean of its divisors is an integer number (940355856).

Almost surely, 2^20101212021 is an apocalyptic number.

It is an amenable number.

20101212021 is a deficient number, since it is larger than the sum of its proper divisors (9990175371).

20101212021 is a wasteful number, since it uses less digits than its factorization.

20101212021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82113.

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

Adding to 20101212021 its reverse (12021210102), we get a palindrome (32122422123).

The spelling of 20101212021 in words is "twenty billion, one hundred one million, two hundred twelve thousand, twenty-one".