421201987 has 2 divisors, whose sum is σ = 421201988. Its totient is φ = 421201986.

The previous prime is 421201981. The next prime is 421201993. The reversal of 421201987 is 789102124.

It is a balanced prime because it is at equal distance from previous prime (421201981) and next prime (421201993).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-421201987 is a prime.

It is a super-2 number, since 2×421201987² = 354822227705496338, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (421201981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210600993 + 210600994.

It is an arithmetic number, because the mean of its divisors is an integer number (210600994).

Almost surely, 2^421201987 is an apocalyptic number.

421201987 is a deficient number, since it is larger than the sum of its proper divisors (1).

421201987 is an equidigital number, since it uses as much as digits as its factorization.

421201987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8064, while the sum is 34.

The square root of 421201987 is about 20523.2060604575. The cubic root of 421201987 is about 749.6009652141.

The spelling of 421201987 in words is "four hundred twenty-one million, two hundred one thousand, nine hundred eighty-seven".