1403157421 has 2 divisors, whose sum is σ = 1403157422. Its totient is φ = 1403157420.

The previous prime is 1403157419. The next prime is 1403157439. The reversal of 1403157421 is 1247513041.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1384881796 + 18275625 = 37214^2 + 4275^2 .

It is an emirp because it is prime and its reverse (1247513041) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1403157421 - 2¹ = 1403157419 is a prime.

It is a super-3 number, since 3×1403157421³ (a number of 28 digits) contains 333 as substring.

Together with 1403157419, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 1403157421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1403157461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 701578710 + 701578711.

It is an arithmetic number, because the mean of its divisors is an integer number (701578711).

Almost surely, 2^1403157421 is an apocalyptic number.

It is an amenable number.

1403157421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1403157421 is an equidigital number, since it uses as much as digits as its factorization.

1403157421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 1403157421 is about 37458.7429180425. The cubic root of 1403157421 is about 1119.5293039648.

The spelling of 1403157421 in words is "one billion, four hundred three million, one hundred fifty-seven thousand, four hundred twenty-one".