7240274251421 has 2 divisors, whose sum is σ = 7240274251422. Its totient is φ = 7240274251420.

The previous prime is 7240274251391. The next prime is 7240274251429. The reversal of 7240274251421 is 1241524720427.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5406606194521 + 1833668056900 = 2325211^2 + 1354130^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7240274251421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7240274251429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3620137125710 + 3620137125711.

It is an arithmetic number, because the mean of its divisors is an integer number (3620137125711).

Almost surely, 2^{7240274251421} is an apocalyptic number.

It is an amenable number.

7240274251421 is a deficient number, since it is larger than the sum of its proper divisors (1).

7240274251421 is an equidigital number, since it uses as much as digits as its factorization.

7240274251421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 250880, while the sum is 41.

Adding to 7240274251421 its reverse (1241524720427), we get a palindrome (8481798971848).

The spelling of 7240274251421 in words is "seven trillion, two hundred forty billion, two hundred seventy-four million, two hundred fifty-one thousand, four hundred twenty-one".