21112111010 has 32 divisors (see below), whose sum is σ = 40326180480. Its totient is φ = 7940762368.

The previous prime is 21112110961. The next prime is 21112111019. The reversal of 21112111010 is 1011121112.

It is a junction number, because it is equal to n+sod(n) for n = 21112110982 and 21112111000.

It is not an unprimeable number, because it can be changed into a prime (21112111019) 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, 764327 + ... + 791466.

It is an arithmetic number, because the mean of its divisors is an integer number (1260193140).

Almost surely, 2^21112111010 is an apocalyptic number.

21112111010 is a deficient number, since it is larger than the sum of its proper divisors (19214069470).

21112111010 is a wasteful number, since it uses less digits than its factorization.

21112111010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1555882.

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 21112111010 its reverse (1011121112), we get a palindrome (22123232122).

The spelling of 21112111010 in words is "twenty-one billion, one hundred twelve million, one hundred eleven thousand, ten".