20101001200021 has 16 divisors (see below), whose sum is σ = 23113950987904. Its totient is φ = 17123400005184.

The previous prime is 20101001199997. The next prime is 20101001200037. The reversal of 20101001200021 is 12000210010102.

It is a cyclic number.

It is not a de Polignac number, because 20101001200021 - 2¹⁷ = 20101001068949 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20101001199980 and 20101001200007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20101001210021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 73678555 + ... + 73950871.

It is an arithmetic number, because the mean of its divisors is an integer number (1444621936744).

Almost surely, 2^{20101001200021} is an apocalyptic number.

It is an amenable number.

20101001200021 is a deficient number, since it is larger than the sum of its proper divisors (3012949787883).

20101001200021 is a wasteful number, since it uses less digits than its factorization.

20101001200021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 337180.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 20101001200021 its reverse (12000210010102), we get a palindrome (32101211210123).

The spelling of 20101001200021 in words is "twenty trillion, one hundred one billion, one million, two hundred thousand, twenty-one".