212400025 has 6 divisors (see below), whose sum is σ = 263376062. Its totient is φ = 169920000.

The previous prime is 212399981. The next prime is 212400037. The reversal of 212400025 is 520004212.

It can be written as a sum of positive squares in 3 ways, for example, as 46840336 + 165559689 = 6844^2 + 12867^2 .

It is not a de Polignac number, because 212400025 - 2⁷ = 212399897 is a prime.

It is a super-2 number, since 2×212400025² = 90227541240001250, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212399981 and 212400008.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4247976 + ... + 4248025.

Almost surely, 2^212400025 is an apocalyptic number.

212400025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

212400025 is a deficient number, since it is larger than the sum of its proper divisors (50976037).

212400025 is an equidigital number, since it uses as much as digits as its factorization.

212400025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8496011 (or 8496006 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 16.

The square root of 212400025 is about 14573.9502194841. The cubic root of 212400025 is about 596.6479981606.

Adding to 212400025 its reverse (520004212), we get a palindrome (732404237).

The spelling of 212400025 in words is "two hundred twelve million, four hundred thousand, twenty-five".