157026421 has 2 divisors, whose sum is σ = 157026422. Its totient is φ = 157026420.

The previous prime is 157026403. The next prime is 157026449. The reversal of 157026421 is 124620751.

It is an a-pointer prime, because the next prime (157026449) can be obtained adding 157026421 to its sum of digits (28).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 83923921 + 73102500 = 9161^2 + 8550^2 .

It is a cyclic number.

It is not a de Polignac number, because 157026421 - 2⁷ = 157026293 is a prime.

It is a Chen prime.

It is a nialpdrome in base 15.

It is a self number, because there is not a number n which added to its sum of digits gives 157026421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (157026461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78513210 + 78513211.

It is an arithmetic number, because the mean of its divisors is an integer number (78513211).

Almost surely, 2^157026421 is an apocalyptic number.

It is an amenable number.

157026421 is a deficient number, since it is larger than the sum of its proper divisors (1).

157026421 is an equidigital number, since it uses as much as digits as its factorization.

157026421 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 157026421 is about 12531.0183544674. The cubic root of 157026421 is about 539.4993313232.

The spelling of 157026421 in words is "one hundred fifty-seven million, twenty-six thousand, four hundred twenty-one".