21000111010 has 16 divisors (see below), whose sum is σ = 38278684800. Its totient is φ = 8293714416.

The previous prime is 21000110993. The next prime is 21000111017. The reversal of 21000111010 is 1011100012.

It is a junction number, because it is equal to n+sod(n) for n = 21000110984 and 21000111002.

It is not an unprimeable number, because it can be changed into a prime (21000111017) 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, 13290420 + ... + 13291999.

It is an arithmetic number, because the mean of its divisors is an integer number (2392417800).

Almost surely, 2^21000111010 is an apocalyptic number.

21000111010 is a deficient number, since it is larger than the sum of its proper divisors (17278573790).

21000111010 is a wasteful number, since it uses less digits than its factorization.

21000111010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26582505.

The product of its (nonzero) digits is 2, while the sum is 7.

Adding to 21000111010 its reverse (1011100012), we get a palindrome (22011211022).

The spelling of 21000111010 in words is "twenty-one billion, one hundred eleven thousand, ten".