21012000012011 has 8 divisors (see below), whose sum is σ = 21827649620448. Its totient is φ = 20210786680000.

The previous prime is 21012000011939. The next prime is 21012000012023. The reversal of 21012000012011 is 11021000021012.

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 21012000012011 - 2³⁸ = 20737122105067 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21012000011983 and 21012000012001.

It is not an unprimeable number, because it can be changed into a prime (21012000012061) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3609066140 + ... + 3609071961.

It is an arithmetic number, because the mean of its divisors is an integer number (2728456202556).

Almost surely, 2^{21012000012011} is an apocalyptic number.

21012000012011 is a deficient number, since it is larger than the sum of its proper divisors (815649608437).

21012000012011 is an equidigital number, since it uses as much as digits as its factorization.

21012000012011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7218138213.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 21012000012011 its reverse (11021000021012), we get a palindrome (32033000033023).

Subtracting from 21012000012011 its reverse (11021000021012), we obtain a palindrome (9990999990999).

The spelling of 21012000012011 in words is "twenty-one trillion, twelve billion, twelve thousand, eleven".