21101203232011 has 4 divisors (see below), whose sum is σ = 24115660836592. Its totient is φ = 18086745627432.

The previous prime is 21101203231967. The next prime is 21101203232047. The reversal of 21101203232011 is 11023230210112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21101203232011 - 2⁹ = 21101203231499 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21101203232011.

It is not an unprimeable number, because it can be changed into a prime (21101203232051) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1507228802280 + ... + 1507228802293.

It is an arithmetic number, because the mean of its divisors is an integer number (6028915209148).

Almost surely, 2^{21101203232011} is an apocalyptic number.

21101203232011 is a deficient number, since it is larger than the sum of its proper divisors (3014457604581).

21101203232011 is an equidigital number, since it uses as much as digits as its factorization.

21101203232011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3014457604580.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 21101203232011 its reverse (11023230210112), we get a palindrome (32124433442123).

The spelling of 21101203232011 in words is "twenty-one trillion, one hundred one billion, two hundred three million, two hundred thirty-two thousand, eleven".