21002121202011 has 8 divisors (see below), whose sum is σ = 28003578019344. Its totient is φ = 14001039259680.

The previous prime is 21002121201991. The next prime is 21002121202093. The reversal of 21002121202011 is 11020212120012.

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

It is not a de Polignac number, because 21002121202011 - 2²³ = 21002112813403 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21002121202411) 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, 93588000 + ... + 93812141.

It is an arithmetic number, because the mean of its divisors is an integer number (3500447252418).

Almost surely, 2^{21002121202011} is an apocalyptic number.

21002121202011 is a deficient number, since it is larger than the sum of its proper divisors (7001456817333).

21002121202011 is a wasteful number, since it uses less digits than its factorization.

21002121202011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187437501.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21002121202011 its reverse (11020212120012), we get a palindrome (32022333322023).

The spelling of 21002121202011 in words is "twenty-one trillion, two billion, one hundred twenty-one million, two hundred two thousand, eleven".