21111010 has 32 divisors (see below), whose sum is σ = 39916800. Its totient is φ = 8023488.

The previous prime is 21111007. The next prime is 21111029. The reversal of 21111010 is 1011112.

It is a junction number, because it is equal to n+sod(n) for n = 21110984 and 21111002.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 60316 + ... + 60664.

It is an arithmetic number, because the mean of its divisors is an integer number (1247400).

Almost surely, 2^21111010 is an apocalyptic number.

21111010 is a deficient number, since it is larger than the sum of its proper divisors (18805790).

21111010 is a wasteful number, since it uses less digits than its factorization.

21111010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 642.

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

The square root of 21111010 is about 4594.6719142938. The cubic root of 21111010 is about 276.3777034923.

Adding to 21111010 its reverse (1011112), we get a palindrome (22122122).

The spelling of 21111010 in words is "twenty-one million, one hundred eleven thousand, ten".