21221202111 has 8 divisors (see below), whose sum is σ = 29059664304. Its totient is φ = 13765104000.

The previous prime is 21221202109. The next prime is 21221202131. The reversal of 21221202111 is 11120212212.

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

It is not a de Polignac number, because 21221202111 - 2¹ = 21221202109 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21221202131) 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, 95590890 + ... + 95591111.

It is an arithmetic number, because the mean of its divisors is an integer number (3632458038).

Almost surely, 2^21221202111 is an apocalyptic number.

21221202111 is a deficient number, since it is larger than the sum of its proper divisors (7838462193).

21221202111 is a wasteful number, since it uses less digits than its factorization.

21221202111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191182041.

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

Adding to 21221202111 its reverse (11120212212), we get a palindrome (32341414323).

The spelling of 21221202111 in words is "twenty-one billion, two hundred twenty-one million, two hundred two thousand, one hundred eleven".