21655236601054 has 8 divisors (see below), whose sum is σ = 37123262744688. Its totient is φ = 9280815686160.

The previous prime is 21655236601051. The next prime is 21655236601073. The reversal of 21655236601054 is 45010663255612.

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

It is a super-3 number, since 3×21655236601054³ (a number of 41 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21655236600995 and 21655236601013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21655236601051) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 773401307167 + ... + 773401307194.

It is an arithmetic number, because the mean of its divisors is an integer number (4640407843086).

Almost surely, 2^{21655236601054} is an apocalyptic number.

21655236601054 is a deficient number, since it is larger than the sum of its proper divisors (15468026143634).

21655236601054 is a wasteful number, since it uses less digits than its factorization.

21655236601054 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1546802614370.

The product of its (nonzero) digits is 1296000, while the sum is 46.

Adding to 21655236601054 its reverse (45010663255612), we get a palindrome (66665899856666).

The spelling of 21655236601054 in words is "twenty-one trillion, six hundred fifty-five billion, two hundred thirty-six million, six hundred one thousand, fifty-four".