20021010102001 has 16 divisors (see below), whose sum is σ = 21432649569408. Its totient is φ = 18655847267200.

The previous prime is 20021010101987. The next prime is 20021010102043. The reversal of 20021010102001 is 10020101012002.

It is a cyclic number.

It is not a de Polignac number, because 20021010102001 - 2¹¹ = 20021010099953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20021010102101) 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, 15041935 + ... + 16318756.

It is an arithmetic number, because the mean of its divisors is an integer number (1339540598088).

Almost surely, 2^{20021010102001} is an apocalyptic number.

It is an amenable number.

20021010102001 is a deficient number, since it is larger than the sum of its proper divisors (1411639467407).

20021010102001 is a wasteful number, since it uses less digits than its factorization.

20021010102001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31361432.

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

Adding to 20021010102001 its reverse (10020101012002), we get a palindrome (30041111114003).

The spelling of 20021010102001 in words is "twenty trillion, twenty-one billion, ten million, one hundred two thousand, one".