213400121 has 16 divisors (see below), whose sum is σ = 239500800. Its totient is φ = 188457600.

The previous prime is 213400087. The next prime is 213400139. The reversal of 213400121 is 121004312.

213400121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-213400121 is a prime.

It is a super-2 number, since 2×213400121² = 91079223285629282, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 213400096 and 213400105.

It is not an unprimeable number, because it can be changed into a prime (213400151) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 120440 + ... + 122198.

It is an arithmetic number, because the mean of its divisors is an integer number (14968800).

Almost surely, 2^213400121 is an apocalyptic number.

It is an amenable number.

213400121 is a deficient number, since it is larger than the sum of its proper divisors (26100679).

213400121 is a wasteful number, since it uses less digits than its factorization.

213400121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2080.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 213400121 is about 14608.2210073643. The cubic root of 213400121 is about 597.5829810697.

Adding to 213400121 its reverse (121004312), we get a palindrome (334404433).

The spelling of 213400121 in words is "two hundred thirteen million, four hundred thousand, one hundred twenty-one".