21472515635 has 8 divisors (see below), whose sum is σ = 27282725856. Its totient is φ = 16167541120.

The previous prime is 21472515629. The next prime is 21472515643. The reversal of 21472515635 is 53651527412.

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

It is not a de Polignac number, because 21472515635 - 2¹² = 21472511539 is a prime.

It is a super-4 number, since 4×21472515635⁴ (a number of 42 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21472515592 and 21472515601.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 126308831 + ... + 126309000.

It is an arithmetic number, because the mean of its divisors is an integer number (3410340732).

Almost surely, 2^21472515635 is an apocalyptic number.

21472515635 is a deficient number, since it is larger than the sum of its proper divisors (5810210221).

21472515635 is a wasteful number, since it uses less digits than its factorization.

21472515635 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 252617853.

The product of its digits is 252000, while the sum is 41.

The spelling of 21472515635 in words is "twenty-one billion, four hundred seventy-two million, five hundred fifteen thousand, six hundred thirty-five".