21440016642 has 16 divisors (see below), whose sum is σ = 46778218272. Its totient is φ = 6496974720.

The previous prime is 21440016641. The next prime is 21440016673. The reversal of 21440016642 is 24661004412.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21440016641) 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, 162424303 + ... + 162424434.

It is an arithmetic number, because the mean of its divisors is an integer number (2923638642).

Almost surely, 2^21440016642 is an apocalyptic number.

21440016642 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21440016642 is an abundant number, since it is smaller than the sum of its proper divisors (25338201630).

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

21440016642 is a wasteful number, since it uses less digits than its factorization.

21440016642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 324848753.

The product of its (nonzero) digits is 9216, while the sum is 30.

The spelling of 21440016642 in words is "twenty-one billion, four hundred forty million, sixteen thousand, six hundred forty-two".