21101021020012 has 12 divisors (see below), whose sum is σ = 37552664527560. Its totient is φ = 10371688297856.

The previous prime is 21101021019959. The next prime is 21101021020061. The reversal of 21101021020012 is 21002012010112.

It is a junction number, because it is equal to n+sod(n) for n = 21101021019974 and 21101021020001.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44705552773 + ... + 44705553244.

It is an arithmetic number, because the mean of its divisors is an integer number (3129388710630).

Almost surely, 2^{21101021020012} is an apocalyptic number.

It is an amenable number.

21101021020012 is a deficient number, since it is larger than the sum of its proper divisors (16451643507548).

21101021020012 is a wasteful number, since it uses less digits than its factorization.

21101021020012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89411106080 (or 89411106078 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21101021020012 its reverse (21002012010112), we get a palindrome (42103033030124).

The spelling of 21101021020012 in words is "twenty-one trillion, one hundred one billion, twenty-one million, twenty thousand, twelve".