21535414545 has 16 divisors (see below), whose sum is σ = 34655838912. Its totient is φ = 11419162560.

The previous prime is 21535414517. The next prime is 21535414561. The reversal of 21535414545 is 54541453512.

It is not a de Polignac number, because 21535414545 - 2²² = 21531220241 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4146811 + ... + 4152000.

It is an arithmetic number, because the mean of its divisors is an integer number (2165989932).

Almost surely, 2^21535414545 is an apocalyptic number.

It is an amenable number.

21535414545 is a deficient number, since it is larger than the sum of its proper divisors (13120424367).

21535414545 is a wasteful number, since it uses less digits than its factorization.

21535414545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8298992.

The product of its digits is 240000, while the sum is 39.

The spelling of 21535414545 in words is "twenty-one billion, five hundred thirty-five million, four hundred fourteen thousand, five hundred forty-five".