211215345 has 32 divisors (see below), whose sum is σ = 369339264. Its totient is φ = 102220800.

The previous prime is 211215337. The next prime is 211215377. The reversal of 211215345 is 543512112.

It is a happy number.

It is not a de Polignac number, because 211215345 - 2³ = 211215337 is a prime.

It is a super-2 number, since 2×211215345² = 89223843926938050, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 144639 + ... + 146091.

It is an arithmetic number, because the mean of its divisors is an integer number (11541852).

Almost surely, 2^211215345 is an apocalyptic number.

It is an amenable number.

211215345 is a deficient number, since it is larger than the sum of its proper divisors (158123919).

211215345 is a wasteful number, since it uses less digits than its factorization.

211215345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2353.

The product of its digits is 1200, while the sum is 24.

The square root of 211215345 is about 14533.2496366092. The cubic root of 211215345 is about 595.5366436360.

Adding to 211215345 its reverse (543512112), we get a palindrome (754727457).

The spelling of 211215345 in words is "two hundred eleven million, two hundred fifteen thousand, three hundred forty-five".