21898429055 has 8 divisors (see below), whose sum is σ = 26278912944. Its totient is φ = 17518211200.

The previous prime is 21898429039. The next prime is 21898429057. The reversal of 21898429055 is 55092489812.

It is a happy number.

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

It is not a de Polignac number, because 21898429055 - 2⁴ = 21898429039 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21898428988 and 21898429006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21898429057) 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, 263060 + ... + 336150.

It is an arithmetic number, because the mean of its divisors is an integer number (3284864118).

Almost surely, 2^21898429055 is an apocalyptic number.

21898429055 is a deficient number, since it is larger than the sum of its proper divisors (4380483889).

21898429055 is an equidigital number, since it uses as much as digits as its factorization.

21898429055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133017.

The product of its (nonzero) digits is 2073600, while the sum is 53.

The spelling of 21898429055 in words is "twenty-one billion, eight hundred ninety-eight million, four hundred twenty-nine thousand, fifty-five".