210021121125 has 192 divisors, whose sum is σ = 406274918400. Its totient is φ = 104146560000.

The previous prime is 210021121111. The next prime is 210021121147. The reversal of 210021121125 is 521121120012.

It is not a de Polignac number, because 210021121125 - 2¹³ = 210021112933 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 210021121098 and 210021121107.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 284196006 + ... + 284196744.

It is an arithmetic number, because the mean of its divisors is an integer number (2116015200).

Almost surely, 2^210021121125 is an apocalyptic number.

210021121125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

210021121125 is a deficient number, since it is larger than the sum of its proper divisors (196253797275).

210021121125 is a wasteful number, since it uses less digits than its factorization.

210021121125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1101 (or 1088 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 18.

Adding to 210021121125 its reverse (521121120012), we get a palindrome (731142241137).

The spelling of 210021121125 in words is "two hundred ten billion, twenty-one million, one hundred twenty-one thousand, one hundred twenty-five".