21033219987 has 36 divisors (see below), whose sum is σ = 33294675960. Its totient is φ = 12787497216.

The previous prime is 21033219983. The next prime is 21033220007. The reversal of 21033219987 is 78991233012.

21033219987 is a `hidden beast` number, since 210 + 332 + 19 + 98 + 7 = 666.

It is not a de Polignac number, because 21033219987 - 2² = 21033219983 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21033219983) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 42939 + ... + 209547.

It is an arithmetic number, because the mean of its divisors is an integer number (924852110).

Almost surely, 2^21033219987 is an apocalyptic number.

21033219987 is a deficient number, since it is larger than the sum of its proper divisors (12261455973).

21033219987 is a wasteful number, since it uses less digits than its factorization.

21033219987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166724 (or 166708 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 45.

The spelling of 21033219987 in words is "twenty-one billion, thirty-three million, two hundred nineteen thousand, nine hundred eighty-seven".