20101001002021 has 4 divisors (see below), whose sum is σ = 21158948423200. Its totient is φ = 19043053580844.

The previous prime is 20101001001979. The next prime is 20101001002063. The reversal of 20101001002021 is 12020010010102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (20101001001979) and next prime (20101001002063).

It is a cyclic number.

It is not a de Polignac number, because 20101001002021 - 2²⁹ = 20100464131109 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20101001001989 and 20101001002007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20101001000021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 528973710561 + ... + 528973710598.

It is an arithmetic number, because the mean of its divisors is an integer number (5289737105800).

Almost surely, 2^{20101001002021} is an apocalyptic number.

It is an amenable number.

20101001002021 is a deficient number, since it is larger than the sum of its proper divisors (1057947421179).

20101001002021 is a wasteful number, since it uses less digits than its factorization.

20101001002021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1057947421178.

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

Adding to 20101001002021 its reverse (12020010010102), we get a palindrome (32121011012123).

The spelling of 20101001002021 in words is "twenty trillion, one hundred one billion, one million, two thousand, twenty-one".