21210012010121 has 8 divisors (see below), whose sum is σ = 23138292471264. Its totient is φ = 19281747807520.

The previous prime is 21210012010087. The next prime is 21210012010157. The reversal of 21210012010121 is 12101021001212.

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

It is a de Polignac number, because none of the positive numbers 2^k-21210012010121 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21210012010096 and 21210012010105.

It is not an unprimeable number, because it can be changed into a prime (21210012010921) 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, 1252340 + ... + 6632373.

It is an arithmetic number, because the mean of its divisors is an integer number (2892286558908).

Almost surely, 2^{21210012010121} is an apocalyptic number.

It is an amenable number.

21210012010121 is a deficient number, since it is larger than the sum of its proper divisors (1928280461143).

21210012010121 is a wasteful number, since it uses less digits than its factorization.

21210012010121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8129271.

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

Adding to 21210012010121 its reverse (12101021001212), we get a palindrome (33311033011333).

It can be divided in two parts, 212100 and 12010121, that added together give a palindrome (12222221).

The spelling of 21210012010121 in words is "twenty-one trillion, two hundred ten billion, twelve million, ten thousand, one hundred twenty-one".