21011001323011 has 4 divisors (see below), whose sum is σ = 24012572940592. Its totient is φ = 18009429705432.

The previous prime is 21011001323003. The next prime is 21011001323063. The reversal of 21011001323011 is 11032310011012.

It is a happy number.

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 21011001323011 - 2³ = 21011001323003 is a prime.

It is a super-2 number, since 2×21011001323011² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21011001327011) 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, 1500785808780 + ... + 1500785808793.

It is an arithmetic number, because the mean of its divisors is an integer number (6003143235148).

Almost surely, 2^{21011001323011} is an apocalyptic number.

21011001323011 is a deficient number, since it is larger than the sum of its proper divisors (3001571617581).

21011001323011 is an equidigital number, since it uses as much as digits as its factorization.

21011001323011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3001571617580.

The product of its (nonzero) digits is 36, while the sum is 16.

Adding to 21011001323011 its reverse (11032310011012), we get a palindrome (32043311334023).

The spelling of 21011001323011 in words is "twenty-one trillion, eleven billion, one million, three hundred twenty-three thousand, eleven".