20000121501 has 4 divisors (see below), whose sum is σ = 26666828672. Its totient is φ = 13333414332.

The previous prime is 20000121437. The next prime is 20000121503. The reversal of 20000121501 is 10512100002.

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 not a de Polignac number, because 20000121501 - 2⁶ = 20000121437 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20000121503) 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, 3333353581 + ... + 3333353586.

It is an arithmetic number, because the mean of its divisors is an integer number (6666707168).

Almost surely, 2^20000121501 is an apocalyptic number.

It is an amenable number.

20000121501 is a deficient number, since it is larger than the sum of its proper divisors (6666707171).

20000121501 is an equidigital number, since it uses as much as digits as its factorization.

20000121501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6666707170.

The product of its (nonzero) digits is 20, while the sum is 12.

Adding to 20000121501 its reverse (10512100002), we get a palindrome (30512221503).

The spelling of 20000121501 in words is "twenty billion, one hundred twenty-one thousand, five hundred one".