210400221 has 8 divisors (see below), whose sum is σ = 281367424. Its totient is φ = 139849920.

The previous prime is 210400219. The next prime is 210400231. The reversal of 210400221 is 122004012.

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

It is not a de Polignac number, because 210400221 - 2¹ = 210400219 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 210400197 and 210400206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210400231) 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, 103045 + ... + 105066.

It is an arithmetic number, because the mean of its divisors is an integer number (35170928).

Almost surely, 2^210400221 is an apocalyptic number.

It is an amenable number.

210400221 is a deficient number, since it is larger than the sum of its proper divisors (70967203).

210400221 is a wasteful number, since it uses less digits than its factorization.

210400221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208451.

The product of its (nonzero) digits is 32, while the sum is 12.

The square root of 210400221 is about 14505.1791095457. The cubic root of 210400221 is about 594.7695560303.

Adding to 210400221 its reverse (122004012), we get a palindrome (332404233).

The spelling of 210400221 in words is "two hundred ten million, four hundred thousand, two hundred twenty-one".