21210223011 has 16 divisors (see below), whose sum is σ = 28853038080. Its totient is φ = 13854503520.

The previous prime is 21210222991. The next prime is 21210223037. The reversal of 21210223011 is 11032201212.

It is not a de Polignac number, because 21210223011 - 2¹¹ = 21210220963 is a prime.

It is a super-2 number, since 2×21210223011² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21210223081) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27246 + ... + 207756.

It is an arithmetic number, because the mean of its divisors is an integer number (1803314880).

Almost surely, 2^21210223011 is an apocalyptic number.

21210223011 is a deficient number, since it is larger than the sum of its proper divisors (7642815069).

21210223011 is a wasteful number, since it uses less digits than its factorization.

21210223011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181306.

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 21210223011 its reverse (11032201212), we get a palindrome (32242424223).

The spelling of 21210223011 in words is "twenty-one billion, two hundred ten million, two hundred twenty-three thousand, eleven".