21900555069 has 8 divisors (see below), whose sum is σ = 29204477760. Its totient is φ = 14598501216.

The previous prime is 21900555049. The next prime is 21900555071. The reversal of 21900555069 is 96055500912.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21900555069 - 2²⁹ = 21363684157 is a prime.

It is a super-2 number, since 2×21900555069² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21900555069.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21900555049) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 439632 + ... + 486905.

It is an arithmetic number, because the mean of its divisors is an integer number (3650559720).

Almost surely, 2^21900555069 is an apocalyptic number.

It is an amenable number.

21900555069 is a deficient number, since it is larger than the sum of its proper divisors (7303922691).

21900555069 is an equidigital number, since it uses as much as digits as its factorization.

21900555069 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 934419.

The product of its (nonzero) digits is 121500, while the sum is 42.

The spelling of 21900555069 in words is "twenty-one billion, nine hundred million, five hundred fifty-five thousand, sixty-nine".