21011023211123 has 8 divisors (see below), whose sum is σ = 22993422594480. Its totient is φ = 19040674888480.

The previous prime is 21011023211117. The next prime is 21011023211177. The reversal of 21011023211123 is 32111232011012.

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

It is a cyclic number.

It is not a de Polignac number, because 21011023211123 - 2⁸ = 21011023210867 is a prime.

It is a super-2 number, since 2×21011023211123² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21011023211095 and 21011023211104.

It is not an unprimeable number, because it can be changed into a prime (21011023211023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3012761528 + ... + 3012768501.

It is an arithmetic number, because the mean of its divisors is an integer number (2874177824310).

Almost surely, 2^{21011023211123} is an apocalyptic number.

21011023211123 is a deficient number, since it is larger than the sum of its proper divisors (1982399383357).

21011023211123 is a wasteful number, since it uses less digits than its factorization.

21011023211123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6025530357.

The product of its (nonzero) digits is 144, while the sum is 20.

Adding to 21011023211123 its reverse (32111232011012), we get a palindrome (53122255222135).

The spelling of 21011023211123 in words is "twenty-one trillion, eleven billion, twenty-three million, two hundred eleven thousand, one hundred twenty-three".