20101212021021 has 8 divisors (see below), whose sum is σ = 26801777019360. Its totient is φ = 13400727518352.

The previous prime is 20101212021019. The next prime is 20101212021031. The reversal of 20101212021021 is 12012021210102.

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

It is not a de Polignac number, because 20101212021021 - 2¹ = 20101212021019 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20101212021031) 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, 19538811 + ... + 20541848.

It is an arithmetic number, because the mean of its divisors is an integer number (3350222127420).

Almost surely, 2^{20101212021021} is an apocalyptic number.

It is an amenable number.

20101212021021 is a deficient number, since it is larger than the sum of its proper divisors (6700564998339).

20101212021021 is a wasteful number, since it uses less digits than its factorization.

20101212021021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40247835.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 20101212021021 its reverse (12012021210102), we get a palindrome (32113233231123).

The spelling of 20101212021021 in words is "twenty trillion, one hundred one billion, two hundred twelve million, twenty-one thousand, twenty-one".