421949851 has 2 divisors, whose sum is σ = 421949852. Its totient is φ = 421949850.

The previous prime is 421949807. The next prime is 421949861. The reversal of 421949851 is 158949124.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 421949851 - 2²³ = 413561243 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 421949798 and 421949807.

It is not a weakly prime, because it can be changed into another prime (421949861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210974925 + 210974926.

It is an arithmetic number, because the mean of its divisors is an integer number (210974926).

Almost surely, 2^421949851 is an apocalyptic number.

421949851 is a deficient number, since it is larger than the sum of its proper divisors (1).

421949851 is an equidigital number, since it uses as much as digits as its factorization.

421949851 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 103680, while the sum is 43.

The square root of 421949851 is about 20541.4179403468. The cubic root of 421949851 is about 750.0443535251.

The spelling of 421949851 in words is "four hundred twenty-one million, nine hundred forty-nine thousand, eight hundred fifty-one".