7507420421 has 2 divisors, whose sum is σ = 7507420422. Its totient is φ = 7507420420.

The previous prime is 7507420387. The next prime is 7507420423. The reversal of 7507420421 is 1240247057.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7324792225 + 182628196 = 85585^2 + 13514^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7507420421 is a prime.

It is a super-2 number, since 2×7507420421² (a number of 21 digits) contains 22 as substring.

Together with 7507420423, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7507420423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3753710210 + 3753710211.

It is an arithmetic number, because the mean of its divisors is an integer number (3753710211).

Almost surely, 2^7507420421 is an apocalyptic number.

It is an amenable number.

7507420421 is a deficient number, since it is larger than the sum of its proper divisors (1).

7507420421 is an equidigital number, since it uses as much as digits as its factorization.

7507420421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15680, while the sum is 32.

The square root of 7507420421 is about 86645.3716074898. The cubic root of 7507420421 is about 1958.0791626009.

Adding to 7507420421 its reverse (1240247057), we get a palindrome (8747667478).

The spelling of 7507420421 in words is "seven billion, five hundred seven million, four hundred twenty thousand, four hundred twenty-one".