2507212121 has 2 divisors, whose sum is σ = 2507212122. Its totient is φ = 2507212120.

The previous prime is 2507212091. The next prime is 2507212151. The reversal of 2507212121 is 1212127052.

It is a balanced prime because it is at equal distance from previous prime (2507212091) and next prime (2507212151).

It can be written as a sum of positive squares in only one way, i.e., 1838265625 + 668946496 = 42875^2 + 25864^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2507212121 is a prime.

It is a super-2 number, since 2×2507212121² = 12572225239378637282, which contains 22 as substring.

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

It is not a weakly prime, because it can be changed into another prime (2507212151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1253606060 + 1253606061.

It is an arithmetic number, because the mean of its divisors is an integer number (1253606061).

Almost surely, 2^2507212121 is an apocalyptic number.

It is an amenable number.

2507212121 is a deficient number, since it is larger than the sum of its proper divisors (1).

2507212121 is an equidigital number, since it uses as much as digits as its factorization.

2507212121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 560, while the sum is 23.

The square root of 2507212121 is about 50072.0692702029. The cubic root of 2507212121 is about 1358.5126691728.

Adding to 2507212121 its reverse (1212127052), we get a palindrome (3719339173).

The spelling of 2507212121 in words is "two billion, five hundred seven million, two hundred twelve thousand, one hundred twenty-one".