9981421954 has 16 divisors (see below), whose sum is σ = 17114790528. Its totient is φ = 4276806912.

The previous prime is 9981421903. The next prime is 9981421969. The reversal of 9981421954 is 4591241899.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11167 + ... + 141730.

It is an arithmetic number, because the mean of its divisors is an integer number (1069674408).

Almost surely, 2^9981421954 is an apocalyptic number.

9981421954 is a deficient number, since it is larger than the sum of its proper divisors (7133368574).

9981421954 is a wasteful number, since it uses less digits than its factorization.

9981421954 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157569.

The product of its digits is 933120, while the sum is 52.

The square root of 9981421954 is about 99907.0665869037. The cubic root of 9981421954 is about 2153.0996900747.

The spelling of 9981421954 in words is "nine billion, nine hundred eighty-one million, four hundred twenty-one thousand, nine hundred fifty-four".