20010020121 has 48 divisors (see below), whose sum is σ = 35608809600. Its totient is φ = 10544221440.

The previous prime is 20010020101. The next prime is 20010020131. The reversal of 20010020121 is 12102001002.

It is not a de Polignac number, because 20010020121 - 2¹⁴ = 20010003737 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20010020101) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 847486 + ... + 870776.

It is an arithmetic number, because the mean of its divisors is an integer number (741850200).

Almost surely, 2^20010020121 is an apocalyptic number.

20010020121 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20010020121 is a deficient number, since it is larger than the sum of its proper divisors (15598789479).

20010020121 is a wasteful number, since it uses less digits than its factorization.

20010020121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24366 (or 24363 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 20010020121 its reverse (12102001002), we get a palindrome (32112021123).

The spelling of 20010020121 in words is "twenty billion, ten million, twenty thousand, one hundred twenty-one".