21109225455 has 64 divisors (see below), whose sum is σ = 37940797440. Its totient is φ = 11134972800.

The previous prime is 21109225451. The next prime is 21109225481. The reversal of 21109225455 is 55452290112.

21109225455 is a `hidden beast` number, since 2 + 1 + 109 + 2 + 2 + 545 + 5 = 666.

It is not a de Polignac number, because 21109225455 - 2² = 21109225451 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21109225451) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4664824 + ... + 4669346.

It is an arithmetic number, because the mean of its divisors is an integer number (592824960).

Almost surely, 2^21109225455 is an apocalyptic number.

21109225455 is a deficient number, since it is larger than the sum of its proper divisors (16831571985).

21109225455 is a wasteful number, since it uses less digits than its factorization.

21109225455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4909 (or 4903 counting only the distinct ones).

The product of its (nonzero) digits is 36000, while the sum is 36.

The spelling of 21109225455 in words is "twenty-one billion, one hundred nine million, two hundred twenty-five thousand, four hundred fifty-five".