20001002202121 has 8 divisors (see below), whose sum is σ = 20456906966784. Its totient is φ = 19546362084480.

The previous prime is 20001002202107. The next prime is 20001002202163. The reversal of 20001002202121 is 12120220010002.

It is a happy number.

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 20001002202121 - 2¹⁵ = 20001002169353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20001002202521) 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, 316129765 + ... + 316193026.

It is an arithmetic number, because the mean of its divisors is an integer number (2557113370848).

Almost surely, 2^{20001002202121} is an apocalyptic number.

It is an amenable number.

20001002202121 is a deficient number, since it is larger than the sum of its proper divisors (455904764663).

20001002202121 is an equidigital number, since it uses as much as digits as its factorization.

20001002202121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 632323511.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 20001002202121 its reverse (12120220010002), we get a palindrome (32121222212123).

The spelling of 20001002202121 in words is "twenty trillion, one billion, two million, two hundred two thousand, one hundred twenty-one".