21120021210011 has 8 divisors (see below), whose sum is σ = 21132994341264. Its totient is φ = 21107049465600.

The previous prime is 21120021209929. The next prime is 21120021210049. The reversal of 21120021210011 is 11001212002112.

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 21120021210011 - 2²² = 21120017015707 is a prime.

It is a super-2 number, since 2×21120021210011² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21120021210611) 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, 30987680 + ... + 31661906.

It is an arithmetic number, because the mean of its divisors is an integer number (2641624292658).

Almost surely, 2^{21120021210011} is an apocalyptic number.

21120021210011 is a deficient number, since it is larger than the sum of its proper divisors (12973131253).

21120021210011 is a wasteful number, since it uses less digits than its factorization.

21120021210011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 693421.

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

Adding to 21120021210011 its reverse (11001212002112), we get a palindrome (32121233212123).

The spelling of 21120021210011 in words is "twenty-one trillion, one hundred twenty billion, twenty-one million, two hundred ten thousand, eleven".