21887827707 has 32 divisors (see below), whose sum is σ = 30699364608. Its totient is φ = 13853863296.

The previous prime is 21887827699. The next prime is 21887827721. The reversal of 21887827707 is 70772878812.

It is a happy number.

It is not a de Polignac number, because 21887827707 - 2³ = 21887827699 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21887827747) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7697428 + ... + 7700270.

It is an arithmetic number, because the mean of its divisors is an integer number (959355144).

Almost surely, 2^21887827707 is an apocalyptic number.

21887827707 is a deficient number, since it is larger than the sum of its proper divisors (8811536901).

21887827707 is a wasteful number, since it uses less digits than its factorization.

21887827707 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4539.

The product of its (nonzero) digits is 4917248, while the sum is 57.

The spelling of 21887827707 in words is "twenty-one billion, eight hundred eighty-seven million, eight hundred twenty-seven thousand, seven hundred seven".