25212101 has 2 divisors, whose sum is σ = 25212102. Its totient is φ = 25212100.

The previous prime is 25212097. The next prime is 25212113. The reversal of 25212101 is 10121252.

25212101 = 3550² + 3551².

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12609601 + 12602500 = 3551^2 + 3550^2 .

It is a cyclic number.

It is not a de Polignac number, because 25212101 - 2² = 25212097 is a prime.

It is a Chen prime.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25212001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12606050 + 12606051.

It is an arithmetic number, because the mean of its divisors is an integer number (12606051).

Almost surely, 2^25212101 is an apocalyptic number.

25212101 is the 3551-st centered square number.

It is an amenable number.

25212101 is a deficient number, since it is larger than the sum of its proper divisors (1).

25212101 is an equidigital number, since it uses as much as digits as its factorization.

25212101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40, while the sum is 14.

The square root of 25212101 is about 5021.1653029949. The cubic root of 25212101 is about 293.2263623669.

Adding to 25212101 its reverse (10121252), we get a palindrome (35333353).

The spelling of 25212101 in words is "twenty-five million, two hundred twelve thousand, one hundred one".