10101212120021 has 12 divisors (see below), whose sum is σ = 11687352868800. Its totient is φ = 8699608522440.

The previous prime is 10101212119979. The next prime is 10101212120033. The reversal of 10101212120021 is 12002121210101.

It is a de Polignac number, because none of the positive numbers 2^k-10101212120021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 10101212119978 and 10101212120005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10101212120081) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2196868541 + ... + 2196873138.

It is an arithmetic number, because the mean of its divisors is an integer number (973946072400).

Almost surely, 2^{10101212120021} is an apocalyptic number.

10101212120021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

10101212120021 is a deficient number, since it is larger than the sum of its proper divisors (1586140748779).

10101212120021 is a wasteful number, since it uses less digits than its factorization.

10101212120021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4393741720 (or 4393741709 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 10101212120021 its reverse (12002121210101), we get a palindrome (22103333330122).

The spelling of 10101212120021 in words is "ten trillion, one hundred one billion, two hundred twelve million, one hundred twenty thousand, twenty-one".