20021216632 has 32 divisors (see below), whose sum is σ = 38006448480. Its totient is φ = 9886688640.

The previous prime is 20021216599. The next prime is 20021216639. The reversal of 20021216632 is 23661212002.

It is a junction number, because it is equal to n+sod(n) for n = 20021216597 and 20021216606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20021216639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 274782 + ... + 339922.

It is an arithmetic number, because the mean of its divisors is an integer number (1187701515).

Almost surely, 2^20021216632 is an apocalyptic number.

It is an amenable number.

20021216632 is a deficient number, since it is larger than the sum of its proper divisors (17985231848).

20021216632 is a wasteful number, since it uses less digits than its factorization.

20021216632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65623 (or 65619 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 25.

Adding to 20021216632 its reverse (23661212002), we get a palindrome (43682428634).

The spelling of 20021216632 in words is "twenty billion, twenty-one million, two hundred sixteen thousand, six hundred thirty-two".