20821002219 has 12 divisors (see below), whose sum is σ = 30080317696. Its totient is φ = 13878112752.

The previous prime is 20821002217. The next prime is 20821002227. The reversal of 20821002219 is 91220012802.

It is not a de Polignac number, because 20821002219 - 2¹ = 20821002217 is a prime.

It is a super-2 number, since 2×20821002219² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20821002192 and 20821002201.

It is not an unprimeable number, because it can be changed into a prime (20821002217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 160672 + ... + 259725.

Almost surely, 2^20821002219 is an apocalyptic number.

20821002219 is a deficient number, since it is larger than the sum of its proper divisors (9259315477).

20821002219 is a wasteful number, since it uses less digits than its factorization.

20821002219 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 425906 (or 425903 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The spelling of 20821002219 in words is "twenty billion, eight hundred twenty-one million, two thousand, two hundred nineteen".