21000350982 has 32 divisors (see below), whose sum is σ = 45631823328. Its totient is φ = 6404461056.

The previous prime is 21000350977. The next prime is 21000350983. The reversal of 21000350982 is 28905300012.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21000350983) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1182493 + ... + 1200120.

It is an arithmetic number, because the mean of its divisors is an integer number (1425994479).

Almost surely, 2^21000350982 is an apocalyptic number.

21000350982 is an abundant number, since it is smaller than the sum of its proper divisors (24631472346).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21000350982 is a wasteful number, since it uses less digits than its factorization.

21000350982 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2382744.

The product of its (nonzero) digits is 4320, while the sum is 30.

Adding to 21000350982 its reverse (28905300012), we get a palindrome (49905650994).

The spelling of 21000350982 in words is "twenty-one billion, three hundred fifty thousand, nine hundred eighty-two".