21021110011 has 8 divisors (see below), whose sum is σ = 24281068464. Its totient is φ = 17985976320.

The previous prime is 21021109979. The next prime is 21021110029. The reversal of 21021110011 is 11001112012.

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 21021110011 - 2⁵ = 21021109979 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21021110011.

It is not an unprimeable number, because it can be changed into a prime (21021114011) 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, 56205990 + ... + 56206363.

It is an arithmetic number, because the mean of its divisors is an integer number (3035133558).

Almost surely, 2^21021110011 is an apocalyptic number.

21021110011 is a deficient number, since it is larger than the sum of its proper divisors (3259958453).

21021110011 is a wasteful number, since it uses less digits than its factorization.

21021110011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112412381.

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 21021110011 its reverse (11001112012), we get a palindrome (32022222023).

The spelling of 21021110011 in words is "twenty-one billion, twenty-one million, one hundred ten thousand, eleven".