21000010022111 has 4 divisors (see below), whose sum is σ = 22235304729312. Its totient is φ = 19764715314912.

The previous prime is 21000010022107. The next prime is 21000010022129. The reversal of 21000010022111 is 11122001000012.

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 21000010022111 - 2² = 21000010022107 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21000010022092 and 21000010022101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21000010022711) 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, 617647353575 + ... + 617647353608.

It is an arithmetic number, because the mean of its divisors is an integer number (5558826182328).

Almost surely, 2^{21000010022111} is an apocalyptic number.

21000010022111 is a deficient number, since it is larger than the sum of its proper divisors (1235294707201).

21000010022111 is a wasteful number, since it uses less digits than its factorization.

21000010022111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1235294707200.

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

Adding to 21000010022111 its reverse (11122001000012), we get a palindrome (32122011022123).

The spelling of 21000010022111 in words is "twenty-one trillion, ten million, twenty-two thousand, one hundred eleven".