20021121202001 has 8 divisors (see below), whose sum is σ = 20062340263680. Its totient is φ = 19979930523168.

The previous prime is 20021121201979. The next prime is 20021121202013. The reversal of 20021121202001 is 10020212112002.

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

It is a cyclic number.

It is not a de Polignac number, because 20021121202001 - 2¹⁸ = 20021120939857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20021121202081) 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, 5683181 + ... + 8505338.

It is an arithmetic number, because the mean of its divisors is an integer number (2507792532960).

Almost surely, 2^{20021121202001} is an apocalyptic number.

It is an amenable number.

20021121202001 is a deficient number, since it is larger than the sum of its proper divisors (41219061679).

20021121202001 is a wasteful number, since it uses less digits than its factorization.

20021121202001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14191423.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 20021121202001 its reverse (10020212112002), we get a palindrome (30041333314003).

The spelling of 20021121202001 in words is "twenty trillion, twenty-one billion, one hundred twenty-one million, two hundred two thousand, one".