21000012012011 has 16 divisors (see below), whose sum is σ = 21469612813440. Its totient is φ = 20531368857600.

The previous prime is 21000012011999. The next prime is 21000012012037. The reversal of 21000012012011 is 11021021000012.

It is a cyclic number.

It is not a de Polignac number, because 21000012012011 - 2⁶ = 21000012011947 is a prime.

It is a super-3 number, since 3×21000012012011³ (a number of 41 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21000012011983 and 21000012012001.

It is not an unprimeable number, because it can be changed into a prime (21000012032011) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 259446395 + ... + 259527323.

It is an arithmetic number, because the mean of its divisors is an integer number (1341850800840).

Almost surely, 2^{21000012012011} is an apocalyptic number.

21000012012011 is a deficient number, since it is larger than the sum of its proper divisors (469600801429).

21000012012011 is a wasteful number, since it uses less digits than its factorization.

21000012012011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86774.

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

Adding to 21000012012011 its reverse (11021021000012), we get a palindrome (32021033012023).

The spelling of 21000012012011 in words is "twenty-one trillion, twelve million, twelve thousand, eleven".