212402505 has 96 divisors (see below), whose sum is σ = 425502720. Its totient is φ = 89886720.

The previous prime is 212402473. The next prime is 212402507. The reversal of 212402505 is 505204212.

It is a happy number.

It is not a de Polignac number, because 212402505 - 2⁵ = 212402473 is a prime.

It is a super-2 number, since 2×212402505² = 90229648260550050, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (212402507) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1111960 + ... + 1112150.

It is an arithmetic number, because the mean of its divisors is an integer number (4432320).

Almost surely, 2^212402505 is an apocalyptic number.

It is an amenable number.

212402505 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

212402505 is a wasteful number, since it uses less digits than its factorization.

212402505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 319 (or 312 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 21.

The square root of 212402505 is about 14574.0353025509. The cubic root of 212402505 is about 596.6503203217.

Adding to 212402505 its reverse (505204212), we get a palindrome (717606717).

The spelling of 212402505 in words is "two hundred twelve million, four hundred two thousand, five hundred five".