33421987 has 2 divisors, whose sum is σ = 33421988. Its totient is φ = 33421986.

The previous prime is 33421981. The next prime is 33422021. The reversal of 33421987 is 78912433.

It is a weak prime.

It is an emirp because it is prime and its reverse (78912433) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 33421987 - 2³ = 33421979 is a prime.

It is a super-2 number, since 2×33421987² = 2234058430056338, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (33421981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16710993 + 16710994.

It is an arithmetic number, because the mean of its divisors is an integer number (16710994).

Almost surely, 2^33421987 is an apocalyptic number.

33421987 is a deficient number, since it is larger than the sum of its proper divisors (1).

33421987 is an equidigital number, since it uses as much as digits as its factorization.

33421987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36288, while the sum is 37.

The square root of 33421987 is about 5781.1752265435. The cubic root of 33421987 is about 322.1148562139.

It can be divided in two parts, 3342 and 1987, that added together give a square (5329 = 73²).

The spelling of 33421987 in words is "thirty-three million, four hundred twenty-one thousand, nine hundred eighty-seven".