21201200122011 has 64 divisors (see below), whose sum is σ = 35959624823808. Its totient is φ = 10811500697088.

The previous prime is 21201200122009. The next prime is 21201200122021. The reversal of 21201200122011 is 11022100210212.

It is not a de Polignac number, because 21201200122011 - 2¹ = 21201200122009 is a prime.

It is a super-2 number, since 2×21201200122011² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21201200122021) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 5098605 + ... + 8270318.

It is an arithmetic number, because the mean of its divisors is an integer number (561869137872).

Almost surely, 2^{21201200122011} is an apocalyptic number.

21201200122011 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21201200122011 is a deficient number, since it is larger than the sum of its proper divisors (14758424701797).

21201200122011 is a wasteful number, since it uses less digits than its factorization.

21201200122011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13369140.

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

Adding to 21201200122011 its reverse (11022100210212), we get a palindrome (32223300332223).

The spelling of 21201200122011 in words is "twenty-one trillion, two hundred one billion, two hundred million, one hundred twenty-two thousand, eleven".