21021200011 has 8 divisors (see below), whose sum is σ = 24039572480. Its totient is φ = 18006663528.

The previous prime is 21021199973. The next prime is 21021200023. The reversal of 21021200011 is 11000212012.

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

It is not a de Polignac number, because 21021200011 - 2²¹ = 21019102859 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21021200041) 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, 947241 + ... + 969178.

It is an arithmetic number, because the mean of its divisors is an integer number (3004946560).

Almost surely, 2^21021200011 is an apocalyptic number.

21021200011 is a deficient number, since it is larger than the sum of its proper divisors (3018372469).

21021200011 is a wasteful number, since it uses less digits than its factorization.

21021200011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1917993.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 21021200011 its reverse (11000212012), we get a palindrome (32021412023).

The spelling of 21021200011 in words is "twenty-one billion, twenty-one million, two hundred thousand, eleven".