200121100021005 has 16 divisors (see below), whose sum is σ = 320779123410624. Its totient is φ = 106536132218880.

The previous prime is 200121100020973. The next prime is 200121100021009. The reversal of 200121100021005 is 500120001121002.

It is not a de Polignac number, because 200121100021005 - 2⁵ = 200121100020973 is a prime.

It is a super-2 number, since 2×200121100021005² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (200121100021009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12195061876 + ... + 12195078285.

It is an arithmetic number, because the mean of its divisors is an integer number (20048695213164).

Almost surely, 2^{200121100021005} is an apocalyptic number.

It is an amenable number.

200121100021005 is a deficient number, since it is larger than the sum of its proper divisors (120658023389619).

200121100021005 is a wasteful number, since it uses less digits than its factorization.

200121100021005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24390140716.

The product of its (nonzero) digits is 40, while the sum is 15.

Adding to 200121100021005 its reverse (500120001121002), we get a palindrome (700241101142007).

The spelling of 200121100021005 in words is "two hundred trillion, one hundred twenty-one billion, one hundred million, twenty-one thousand, five".