210120021021 has 8 divisors (see below), whose sum is σ = 280206138880. Its totient is φ = 140056958592.

The previous prime is 210120021017. The next prime is 210120021053. The reversal of 210120021021 is 120120021012.

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

It is not a de Polignac number, because 210120021021 - 2² = 210120021017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 210120020988 and 210120021006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210120021091) 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, 5742580 + ... + 5779053.

It is an arithmetic number, because the mean of its divisors is an integer number (35025767360).

Almost surely, 2^210120021021 is an apocalyptic number.

It is an amenable number.

210120021021 is a deficient number, since it is larger than the sum of its proper divisors (70086117859).

210120021021 is a wasteful number, since it uses less digits than its factorization.

210120021021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11527715.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 210120021021 its reverse (120120021012), we get a palindrome (330240042033).

Subtracting from 210120021021 its reverse (120120021012), we obtain a palindrome (90000000009).

The spelling of 210120021021 in words is "two hundred ten billion, one hundred twenty million, twenty-one thousand, twenty-one".