28603396421 has 2 divisors, whose sum is σ = 28603396422. Its totient is φ = 28603396420.

The previous prime is 28603396399. The next prime is 28603396433. The reversal of 28603396421 is 12469330682.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28556268196 + 47128225 = 168986^2 + 6865^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28603396421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28603396721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14301698210 + 14301698211.

It is an arithmetic number, because the mean of its divisors is an integer number (14301698211).

Almost surely, 2^28603396421 is an apocalyptic number.

It is an amenable number.

28603396421 is a deficient number, since it is larger than the sum of its proper divisors (1).

28603396421 is an equidigital number, since it uses as much as digits as its factorization.

28603396421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 373248, while the sum is 44.

The spelling of 28603396421 in words is "twenty-eight billion, six hundred three million, three hundred ninety-six thousand, four hundred twenty-one".