21465043501 has 8 divisors (see below), whose sum is σ = 23519569824. Its totient is φ = 19427710320.

The previous prime is 21465043493. The next prime is 21465043531. The reversal of 21465043501 is 10534056412.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21465043501 - 2³ = 21465043493 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 (21465043531) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4295670 + ... + 4300663.

It is an arithmetic number, because the mean of its divisors is an integer number (2939946228).

Almost surely, 2^21465043501 is an apocalyptic number.

It is an amenable number.

21465043501 is a deficient number, since it is larger than the sum of its proper divisors (2054526323).

21465043501 is a wasteful number, since it uses less digits than its factorization.

21465043501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8596571.

The product of its (nonzero) digits is 14400, while the sum is 31.

Adding to 21465043501 its reverse (10534056412), we get a palindrome (31999099913).

The spelling of 21465043501 in words is "twenty-one billion, four hundred sixty-five million, forty-three thousand, five hundred one".