21436465651 has 8 divisors (see below), whose sum is σ = 21978968000. Its totient is φ = 20895962472.

The previous prime is 21436465643. The next prime is 21436465679. The reversal of 21436465651 is 15656463412.

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 21436465651 - 2³ = 21436465643 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21436465598 and 21436465607.

It is not an unprimeable number, because it can be changed into a prime (21436475651) 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, 478065 + ... + 520978.

It is an arithmetic number, because the mean of its divisors is an integer number (2747371000).

Almost surely, 2^21436465651 is an apocalyptic number.

21436465651 is a deficient number, since it is larger than the sum of its proper divisors (542502349).

21436465651 is an equidigital number, since it uses as much as digits as its factorization.

21436465651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 999585.

The product of its digits is 518400, while the sum is 43.

The spelling of 21436465651 in words is "twenty-one billion, four hundred thirty-six million, four hundred sixty-five thousand, six hundred fifty-one".