15722401421 has 2 divisors, whose sum is σ = 15722401422. Its totient is φ = 15722401420.

The previous prime is 15722401349. The next prime is 15722401423. The reversal of 15722401421 is 12410422751.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15722401321 + 100 = 125389^2 + 10^2 .

It is an emirp because it is prime and its reverse (12410422751) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 15722401421 - 2²² = 15718207117 is a prime.

Together with 15722401423, 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 (15722401423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7861200710 + 7861200711.

It is an arithmetic number, because the mean of its divisors is an integer number (7861200711).

Almost surely, 2^15722401421 is an apocalyptic number.

It is an amenable number.

15722401421 is a deficient number, since it is larger than the sum of its proper divisors (1).

15722401421 is an equidigital number, since it uses as much as digits as its factorization.

15722401421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4480, while the sum is 29.

The spelling of 15722401421 in words is "fifteen billion, seven hundred twenty-two million, four hundred one thousand, four hundred twenty-one".