21415540444023 has 32 divisors (see below), whose sum is σ = 31996023955200. Its totient is φ = 12626647580160.

The previous prime is 21415540443931. The next prime is 21415540444079. The reversal of 21415540444023 is 32044404551412.

It is not a de Polignac number, because 21415540444023 - 2¹² = 21415540439927 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21415540444423) 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, 8039128 + ... + 10366226.

It is an arithmetic number, because the mean of its divisors is an integer number (999875748600).

Almost surely, 2^{21415540444023} is an apocalyptic number.

21415540444023 is a deficient number, since it is larger than the sum of its proper divisors (10580483511177).

21415540444023 is a wasteful number, since it uses less digits than its factorization.

21415540444023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2334687.

The product of its (nonzero) digits is 307200, while the sum is 39.

Adding to 21415540444023 its reverse (32044404551412), we get a palindrome (53459944995435).

The spelling of 21415540444023 in words is "twenty-one trillion, four hundred fifteen billion, five hundred forty million, four hundred forty-four thousand, twenty-three".