21537560472501 has 8 divisors (see below), whose sum is σ = 29203471827360. Its totient is φ = 14115011382992.

The previous prime is 21537560472499. The next prime is 21537560472529. The reversal of 21537560472501 is 10527406573512.

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 21537560472501 - 2¹ = 21537560472499 is a prime.

It is a super-2 number, since 2×21537560472501² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21537560472601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 60840566130 + ... + 60840566483.

It is an arithmetic number, because the mean of its divisors is an integer number (3650433978420).

Almost surely, 2^{21537560472501} is an apocalyptic number.

It is an amenable number.

21537560472501 is a deficient number, since it is larger than the sum of its proper divisors (7665911354859).

21537560472501 is a wasteful number, since it uses less digits than its factorization.

21537560472501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121681132675.

The product of its (nonzero) digits is 1764000, while the sum is 48.

The spelling of 21537560472501 in words is "twenty-one trillion, five hundred thirty-seven billion, five hundred sixty million, four hundred seventy-two thousand, five hundred one".