21200101012121 has 8 divisors (see below), whose sum is σ = 21418973786784. Its totient is φ = 20981234666880.

The previous prime is 21200101012067. The next prime is 21200101012127. The reversal of 21200101012121 is 12121010100212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21200101012121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21200101012096 and 21200101012105.

It is not an unprimeable number, because it can be changed into a prime (21200101012127) 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, 5168066 + ... + 8313188.

It is an arithmetic number, because the mean of its divisors is an integer number (2677371723348).

Almost surely, 2^{21200101012121} is an apocalyptic number.

It is an amenable number.

21200101012121 is a deficient number, since it is larger than the sum of its proper divisors (218872774663).

21200101012121 is an equidigital number, since it uses as much as digits as its factorization.

21200101012121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3214711.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21200101012121 its reverse (12121010100212), we get a palindrome (33321111112333).

The spelling of 21200101012121 in words is "twenty-one trillion, two hundred billion, one hundred one million, twelve thousand, one hundred twenty-one".