20211201210021 has 32 divisors (see below), whose sum is σ = 27520010772480. Its totient is φ = 13189457945664.

The previous prime is 20211201210001. The next prime is 20211201210029. The reversal of 20211201210021 is 12001210211202.

It is not a de Polignac number, because 20211201210021 - 2⁵ = 20211201209989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20211201210029) 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, 186328920 + ... + 186437358.

It is an arithmetic number, because the mean of its divisors is an integer number (860000336640).

Almost surely, 2^{20211201210021} is an apocalyptic number.

It is an amenable number.

20211201210021 is a deficient number, since it is larger than the sum of its proper divisors (7308809562459).

20211201210021 is a wasteful number, since it uses less digits than its factorization.

20211201210021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111185.

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

Adding to 20211201210021 its reverse (12001210211202), we get a palindrome (32212411421223).

The spelling of 20211201210021 in words is "twenty trillion, two hundred eleven billion, two hundred one million, two hundred ten thousand, twenty-one".