20211320998 has 16 divisors (see below), whose sum is σ = 33414033744. Its totient is φ = 9092252160.

The previous prime is 20211320981. The next prime is 20211320999. The reversal of 20211320998 is 89902311202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20211320999) 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, 4733415 + ... + 4737682.

It is an arithmetic number, because the mean of its divisors is an integer number (2088377109).

Almost surely, 2^20211320998 is an apocalyptic number.

20211320998 is a deficient number, since it is larger than the sum of its proper divisors (13202712746).

20211320998 is a wasteful number, since it uses less digits than its factorization.

20211320998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9471207.

The product of its (nonzero) digits is 15552, while the sum is 37.

The spelling of 20211320998 in words is "twenty billion, two hundred eleven million, three hundred twenty thousand, nine hundred ninety-eight".