21155324046645 has 16 divisors (see below), whose sum is σ = 33848596290240. Its totient is φ = 11282813553024.

The previous prime is 21155324046631. The next prime is 21155324046671. The reversal of 21155324046645 is 54664042355112.

It is not a de Polignac number, because 21155324046645 - 2⁵ = 21155324046613 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21155324046594 and 21155324046603.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6401937 + ... + 9126633.

It is an arithmetic number, because the mean of its divisors is an integer number (2115537268140).

Almost surely, 2^{21155324046645} is an apocalyptic number.

It is an amenable number.

21155324046645 is a deficient number, since it is larger than the sum of its proper divisors (12693272243595).

21155324046645 is a wasteful number, since it uses less digits than its factorization.

21155324046645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3242324.

The product of its (nonzero) digits is 3456000, while the sum is 48.

The spelling of 21155324046645 in words is "twenty-one trillion, one hundred fifty-five billion, three hundred twenty-four million, forty-six thousand, six hundred forty-five".