21012012110 has 32 divisors (see below), whose sum is σ = 38016911520. Its totient is φ = 8361464832.

The previous prime is 21012012083. The next prime is 21012012137. The reversal of 21012012110 is 1121021012.

It is an interprime number because it is at equal distance from previous prime (21012012083) and next prime (21012012137).

It is a junction number, because it is equal to n+sod(n) for n = 21012012091 and 21012012100.

It is a congruent number.

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, 4031186 + ... + 4036394.

It is an arithmetic number, because the mean of its divisors is an integer number (1188028485).

Almost surely, 2^21012012110 is an apocalyptic number.

21012012110 is a deficient number, since it is larger than the sum of its proper divisors (17004899410).

21012012110 is a wasteful number, since it uses less digits than its factorization.

21012012110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7220.

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

Adding to 21012012110 its reverse (1121021012), we get a palindrome (22133033122).

The spelling of 21012012110 in words is "twenty-one billion, twelve million, twelve thousand, one hundred ten".