21018070055 has 8 divisors (see below), whose sum is σ = 25836847344. Its totient is φ = 16404347200.

The previous prime is 21018069983. The next prime is 21018070057. The reversal of 21018070055 is 55007081012.

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

It is not a de Polignac number, because 21018070055 - 2¹⁸ = 21017807911 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21018070057) 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, 51263381 + ... + 51263790.

It is an arithmetic number, because the mean of its divisors is an integer number (3229605918).

Almost surely, 2^21018070055 is an apocalyptic number.

21018070055 is a deficient number, since it is larger than the sum of its proper divisors (4818777289).

21018070055 is a wasteful number, since it uses less digits than its factorization.

21018070055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102527217.

The product of its (nonzero) digits is 2800, while the sum is 29.

The spelling of 21018070055 in words is "twenty-one billion, eighteen million, seventy thousand, fifty-five".