21221033011 has 8 divisors (see below), whose sum is σ = 22488228000. Its totient is φ = 19989533760.

The previous prime is 21221032999. The next prime is 21221033017. The reversal of 21221033011 is 11033012212.

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 21221033011 - 2⁷ = 21221032883 is a prime.

It is a super-2 number, since 2×21221033011² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21221033017) 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, 8922711 + ... + 8925088.

It is an arithmetic number, because the mean of its divisors is an integer number (2811028500).

Almost surely, 2^21221033011 is an apocalyptic number.

21221033011 is a deficient number, since it is larger than the sum of its proper divisors (1267194989).

21221033011 is a wasteful number, since it uses less digits than its factorization.

21221033011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17847869.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 21221033011 its reverse (11033012212), we get a palindrome (32254045223).

The spelling of 21221033011 in words is "twenty-one billion, two hundred twenty-one million, thirty-three thousand, eleven".