21652170051 has 8 divisors (see below), whose sum is σ = 28870365184. Its totient is φ = 14434377480.

The previous prime is 21652170049. The next prime is 21652170053. The reversal of 21652170051 is 15007125612.

It is an interprime number because it is at equal distance from previous prime (21652170049) and next prime (21652170053).

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

It is not a de Polignac number, because 21652170051 - 2¹ = 21652170049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21652170053) 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, 62766 + ... + 217356.

It is an arithmetic number, because the mean of its divisors is an integer number (3608795648).

Almost surely, 2^21652170051 is an apocalyptic number.

21652170051 is a deficient number, since it is larger than the sum of its proper divisors (7218195133).

21652170051 is a wasteful number, since it uses less digits than its factorization.

21652170051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201281.

The product of its (nonzero) digits is 4200, while the sum is 30.

Adding to 21652170051 its reverse (15007125612), we get a palindrome (36659295663).

The spelling of 21652170051 in words is "twenty-one billion, six hundred fifty-two million, one hundred seventy thousand, fifty-one".