21892697545 has 48 divisors (see below), whose sum is σ = 28933811712. Its totient is φ = 15866090240.

The previous prime is 21892697521. The next prime is 21892697549. The reversal of 21892697545 is 54579629812.

It is a happy number.

It is not a de Polignac number, because 21892697545 - 2¹¹ = 21892695497 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21892697545.

It is not an unprimeable number, because it can be changed into a prime (21892697549) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 5123760 + ... + 5128030.

It is an arithmetic number, because the mean of its divisors is an integer number (602787744).

Almost surely, 2^21892697545 is an apocalyptic number.

It is an amenable number.

21892697545 is a deficient number, since it is larger than the sum of its proper divisors (7041114167).

21892697545 is a wasteful number, since it uses less digits than its factorization.

21892697545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4410 (or 4381 counting only the distinct ones).

The product of its digits is 10886400, while the sum is 58.

The spelling of 21892697545 in words is "twenty-one billion, eight hundred ninety-two million, six hundred ninety-seven thousand, five hundred forty-five".