211421345 has 8 divisors (see below), whose sum is σ = 255704064. Its totient is φ = 167804784.

The previous prime is 211421321. The next prime is 211421387. The reversal of 211421345 is 543124112.

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

It is a cyclic number.

It is not a de Polignac number, because 211421345 - 2²⁴ = 194644129 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 211421345.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 165839 + ... + 167108.

It is an arithmetic number, because the mean of its divisors is an integer number (31963008).

Almost surely, 2^211421345 is an apocalyptic number.

It is an amenable number.

211421345 is a deficient number, since it is larger than the sum of its proper divisors (44282719).

211421345 is a wasteful number, since it uses less digits than its factorization.

211421345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333079.

The product of its digits is 960, while the sum is 23.

The square root of 211421345 is about 14540.3351061796. The cubic root of 211421345 is about 595.7301912630.

Adding to 211421345 its reverse (543124112), we get a palindrome (754545457).

The spelling of 211421345 in words is "two hundred eleven million, four hundred twenty-one thousand, three hundred forty-five".