42154221257 has 2 divisors, whose sum is σ = 42154221258. Its totient is φ = 42154221256.

The previous prime is 42154221203. The next prime is 42154221271. The reversal of 42154221257 is 75212245124.

42154221257 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 40831880761 + 1322340496 = 202069^2 + 36364^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42154221257 is a prime.

It is a super-2 number, since 2×42154221257² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (42154223257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21077110628 + 21077110629.

It is an arithmetic number, because the mean of its divisors is an integer number (21077110629).

Almost surely, 2^42154221257 is an apocalyptic number.

It is an amenable number.

42154221257 is a deficient number, since it is larger than the sum of its proper divisors (1).

42154221257 is an equidigital number, since it uses as much as digits as its factorization.

42154221257 is an evil number, because the sum of its binary digits is even.

The product of its digits is 44800, while the sum is 35.

The spelling of 42154221257 in words is "forty-two billion, one hundred fifty-four million, two hundred twenty-one thousand, two hundred fifty-seven".