21154004445 has 32 divisors (see below), whose sum is σ = 40717486080. Its totient is φ = 9161432640.

The previous prime is 21154004437. The next prime is 21154004453. The reversal of 21154004445 is 54440045112.

It is an interprime number because it is at equal distance from previous prime (21154004437) and next prime (21154004453).

It is not a de Polignac number, because 21154004445 - 2³ = 21154004437 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5299761 + ... + 5303750.

It is an arithmetic number, because the mean of its divisors is an integer number (1272421440).

Almost surely, 2^21154004445 is an apocalyptic number.

It is an amenable number.

21154004445 is a deficient number, since it is larger than the sum of its proper divisors (19563481635).

21154004445 is a wasteful number, since it uses less digits than its factorization.

21154004445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10603545.

The product of its (nonzero) digits is 12800, while the sum is 30.

Adding to 21154004445 its reverse (54440045112), we get a palindrome (75594049557).

The spelling of 21154004445 in words is "twenty-one billion, one hundred fifty-four million, four thousand, four hundred forty-five".