21516242377701 has 16 divisors (see below), whose sum is σ = 28812774713600. Its totient is φ = 14282004162240.

The previous prime is 21516242377699. The next prime is 21516242377711. The reversal of 21516242377701 is 10777324261512.

It is not a de Polignac number, because 21516242377701 - 2¹ = 21516242377699 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21516242377711) 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, 7283350 + ... + 9802023.

It is an arithmetic number, because the mean of its divisors is an integer number (1800798419600).

Almost surely, 2^{21516242377701} is an apocalyptic number.

It is an amenable number.

21516242377701 is a deficient number, since it is larger than the sum of its proper divisors (7296532335899).

21516242377701 is a wasteful number, since it uses less digits than its factorization.

21516242377701 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17087196.

The product of its (nonzero) digits is 987840, while the sum is 48.

The spelling of 21516242377701 in words is "twenty-one trillion, five hundred sixteen billion, two hundred forty-two million, three hundred seventy-seven thousand, seven hundred one".