21346623455 has 8 divisors (see below), whose sum is σ = 25635376800. Its totient is φ = 17064346336.

The previous prime is 21346623437. The next prime is 21346623457. The reversal of 21346623455 is 55432664312.

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 21346623455 - 2¹⁰ = 21346622431 is a prime.

It is a super-2 number, since 2×21346623455² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21346623457) 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, 1611800 + ... + 1624989.

It is an arithmetic number, because the mean of its divisors is an integer number (3204422100).

Almost surely, 2^21346623455 is an apocalyptic number.

21346623455 is a deficient number, since it is larger than the sum of its proper divisors (4288753345).

21346623455 is a wasteful number, since it uses less digits than its factorization.

21346623455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3238113.

The product of its digits is 518400, while the sum is 41.

The spelling of 21346623455 in words is "twenty-one billion, three hundred forty-six million, six hundred twenty-three thousand, four hundred fifty-five".