21984961434 has 16 divisors (see below), whose sum is σ = 44064895872. Its totient is φ = 7312491648.

The previous prime is 21984961387. The next prime is 21984961441. The reversal of 21984961434 is 43416948912.

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, 3954199 + ... + 3959754.

It is an arithmetic number, because the mean of its divisors is an integer number (2754055992).

Almost surely, 2^21984961434 is an apocalyptic number.

21984961434 is an abundant number, since it is smaller than the sum of its proper divisors (22079934438).

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

21984961434 is a wasteful number, since it uses less digits than its factorization.

21984961434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7914421.

The product of its digits is 1492992, while the sum is 51.

The spelling of 21984961434 in words is "twenty-one billion, nine hundred eighty-four million, nine hundred sixty-one thousand, four hundred thirty-four".