210121151056 has 20 divisors (see below), whose sum is σ = 407119602400. Its totient is φ = 105058027872.

The previous prime is 210121151017. The next prime is 210121151059. The reversal of 210121151056 is 650151121012.

It is a self number, because there is not a number n which added to its sum of digits gives 210121151056.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210121151059) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 643975 + ... + 913753.

It is an arithmetic number, because the mean of its divisors is an integer number (20355980120).

Almost surely, 2^210121151056 is an apocalyptic number.

It is an amenable number.

210121151056 is a deficient number, since it is larger than the sum of its proper divisors (196998451344).

210121151056 is a wasteful number, since it uses less digits than its factorization.

210121151056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 318466 (or 318460 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 25.

Adding to 210121151056 its reverse (650151121012), we get a palindrome (860272272068).

The spelling of 210121151056 in words is "two hundred ten billion, one hundred twenty-one million, one hundred fifty-one thousand, fifty-six".