21110620721058 has 96 divisors (see below), whose sum is σ = 50581523865600. Its totient is φ = 6309671752800.

The previous prime is 21110620721051. The next prime is 21110620721059. The reversal of 21110620721058 is 85012702601112.

It is a happy number.

21110620721058 is a `hidden beast` number, since 2 + 1 + 1 + 1 + 0 + 620 + 7 + 21 + 0 + 5 + 8 = 666.

It is not an unprimeable number, because it can be changed into a prime (21110620721051) 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, 14493423 + ... + 15883341.

It is an arithmetic number, because the mean of its divisors is an integer number (526890873600).

Almost surely, 2^{21110620721058} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21110620721058, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25290761932800).

21110620721058 is an abundant number, since it is smaller than the sum of its proper divisors (29470903144542).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21110620721058 is a wasteful number, since it uses less digits than its factorization.

21110620721058 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1390988 (or 1390985 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 36.

The spelling of 21110620721058 in words is "twenty-one trillion, one hundred ten billion, six hundred twenty million, seven hundred twenty-one thousand, fifty-eight".