21326541654 has 16 divisors (see below), whose sum is σ = 46530636480. Its totient is φ = 6462588360.

The previous prime is 21326541653. The next prime is 21326541661. The reversal of 21326541654 is 45614562312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21326541653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 161564644 + ... + 161564775.

It is an arithmetic number, because the mean of its divisors is an integer number (2908164780).

Almost surely, 2^21326541654 is an apocalyptic number.

21326541654 is an abundant number, since it is smaller than the sum of its proper divisors (25204094826).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21326541654 is a wasteful number, since it uses less digits than its factorization.

21326541654 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 323129435.

The product of its digits is 172800, while the sum is 39.

The spelling of 21326541654 in words is "twenty-one billion, three hundred twenty-six million, five hundred forty-one thousand, six hundred fifty-four".