212421025 has 6 divisors (see below), whose sum is σ = 263402102. Its totient is φ = 169936800.

The previous prime is 212421019. The next prime is 212421029. The reversal of 212421025 is 520124212.

It can be written as a sum of positive squares in 3 ways, for example, as 77841 + 212343184 = 279^2 + 14572^2 .

It is a de Polignac number, because none of the positive numbers 2^k-212421025 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212420993 and 212421011.

It is not an unprimeable number, because it can be changed into a prime (212421029) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4248396 + ... + 4248445.

Almost surely, 2^212421025 is an apocalyptic number.

212421025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

212421025 is a deficient number, since it is larger than the sum of its proper divisors (50981077).

212421025 is an equidigital number, since it uses as much as digits as its factorization.

212421025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8496851 (or 8496846 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 19.

The square root of 212421025 is about 14574.6706652329. The cubic root of 212421025 is about 596.6676610507.

Adding to 212421025 its reverse (520124212), we get a palindrome (732545237).

The spelling of 212421025 in words is "two hundred twelve million, four hundred twenty-one thousand, twenty-five".