20201221982 has 16 divisors (see below), whose sum is σ = 31381228032. Its totient is φ = 9742935960.

The previous prime is 20201221981. The next prime is 20201221993. The reversal of 20201221982 is 28912210202.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20201221981) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 511628 + ... + 549695.

It is an arithmetic number, because the mean of its divisors is an integer number (1961326752).

Almost surely, 2^20201221982 is an apocalyptic number.

20201221982 is a deficient number, since it is larger than the sum of its proper divisors (11180006050).

20201221982 is a wasteful number, since it uses less digits than its factorization.

20201221982 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1061663.

The product of its (nonzero) digits is 2304, while the sum is 29.

The spelling of 20201221982 in words is "twenty billion, two hundred one million, two hundred twenty-one thousand, nine hundred eighty-two".