1210100000021 has 8 divisors (see below), whose sum is σ = 1320125952288. Its totient is φ = 1100076858000.

The previous prime is 1210099999993. The next prime is 1210100000033. The reversal of 1210100000021 is 1200000010121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1210100000021 - 2¹⁰ = 1210099998997 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1210099999954 and 1210100000008.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1210100000051) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 254486 + ... + 1576376.

It is an arithmetic number, because the mean of its divisors is an integer number (165015744036).

Almost surely, 2^{1210100000021} is an apocalyptic number.

1210100000021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1210100000021 is a deficient number, since it is larger than the sum of its proper divisors (110025952267).

1210100000021 is a wasteful number, since it uses less digits than its factorization.

1210100000021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1405123.

The product of its (nonzero) digits is 4, while the sum is 8.

Adding to 1210100000021 its reverse (1200000010121), we get a palindrome (2410100010142).

The spelling of 1210100000021 in words is "one trillion, two hundred ten billion, one hundred million, twenty-one", and thus it is an aban number.