210121120044 has 72 divisors (see below), whose sum is σ = 589245733440. Its totient is φ = 62593855200.

The previous prime is 210121120037. The next prime is 210121120051. The reversal of 210121120044 is 440021121012.

210121120044 is a `hidden beast` number, since 210 + 1 + 211 + 200 + 44 = 666.

It is an interprime number because it is at equal distance from previous prime (210121120037) and next prime (210121120051).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 210121119999 and 210121120026.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4473322 + ... + 4520049.

It is an arithmetic number, because the mean of its divisors is an integer number (8183968520).

Almost surely, 2^210121120044 is an apocalyptic number.

It is an amenable number.

210121120044 is an abundant number, since it is smaller than the sum of its proper divisors (379124613396).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

210121120044 is a wasteful number, since it uses less digits than its factorization.

210121120044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8993451 (or 8993446 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 210121120044 its reverse (440021121012), we get a palindrome (650142241056).

The spelling of 210121120044 in words is "two hundred ten billion, one hundred twenty-one million, one hundred twenty thousand, forty-four".