21100020003121 has 8 divisors (see below), whose sum is σ = 21372355226880. Its totient is φ = 20827815938592.

The previous prime is 21100020003113. The next prime is 21100020003133. The reversal of 21100020003121 is 12130002000112.

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 21100020003121 - 2³ = 21100020003113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21100020703121) 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, 32465965 + ... + 33109498.

It is an arithmetic number, because the mean of its divisors is an integer number (2671544403360).

Almost surely, 2^{21100020003121} is an apocalyptic number.

It is an amenable number.

21100020003121 is a deficient number, since it is larger than the sum of its proper divisors (272335223759).

21100020003121 is an equidigital number, since it uses as much as digits as its factorization.

21100020003121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65579615.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 21100020003121 its reverse (12130002000112), we get a palindrome (33230022003233).

The spelling of 21100020003121 in words is "twenty-one trillion, one hundred billion, twenty million, three thousand, one hundred twenty-one".