21501445413 has 16 divisors (see below), whose sum is σ = 32834280960. Its totient is φ = 12260225136.

The previous prime is 21501445411. The next prime is 21501445423. The reversal of 21501445413 is 31454410512.

It is not a de Polignac number, because 21501445413 - 2¹ = 21501445411 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21501445411) 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, 1086423 + ... + 1106036.

It is an arithmetic number, because the mean of its divisors is an integer number (2052142560).

Almost surely, 2^21501445413 is an apocalyptic number.

It is an amenable number.

21501445413 is a deficient number, since it is larger than the sum of its proper divisors (11332835547).

21501445413 is a wasteful number, since it uses less digits than its factorization.

21501445413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2192936.

The product of its (nonzero) digits is 9600, while the sum is 30.

Adding to 21501445413 its reverse (31454410512), we get a palindrome (52955855925).

The spelling of 21501445413 in words is "twenty-one billion, five hundred one million, four hundred forty-five thousand, four hundred thirteen".