21210121002011 has 4 divisors (see below), whose sum is σ = 21224738592024. Its totient is φ = 21195503412000.

The previous prime is 21210121001963. The next prime is 21210121002043. The reversal of 21210121002011 is 11020012101212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21210121002011 - 2⁶ = 21210121001947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21210121002061) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7308792830 + ... + 7308795731.

It is an arithmetic number, because the mean of its divisors is an integer number (5306184648006).

Almost surely, 2^{21210121002011} is an apocalyptic number.

21210121002011 is a deficient number, since it is larger than the sum of its proper divisors (14617590013).

21210121002011 is a wasteful number, since it uses less digits than its factorization.

21210121002011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14617590012.

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

Adding to 21210121002011 its reverse (11020012101212), we get a palindrome (32230133103223).

The spelling of 21210121002011 in words is "twenty-one trillion, two hundred ten billion, one hundred twenty-one million, two thousand, eleven".