21031210011 has 16 divisors (see below), whose sum is σ = 32165823488. Its totient is φ = 11973484800.

The previous prime is 21031210003. The next prime is 21031210021. The reversal of 21031210011 is 11001213012.

It is not a de Polignac number, because 21031210011 - 2³ = 21031210003 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21031210021) 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, 1842070 + ... + 1853451.

It is an arithmetic number, because the mean of its divisors is an integer number (2010363968).

Almost surely, 2^21031210011 is an apocalyptic number.

21031210011 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21031210011 is a deficient number, since it is larger than the sum of its proper divisors (11134613477).

21031210011 is a wasteful number, since it uses less digits than its factorization.

21031210011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3695802.

The product of its (nonzero) digits is 12, while the sum is 12.

Adding to 21031210011 its reverse (11001213012), we get a palindrome (32032423023).

The spelling of 21031210011 in words is "twenty-one billion, thirty-one million, two hundred ten thousand, eleven".