20210021105 has 16 divisors (see below), whose sum is σ = 24462220800. Its totient is φ = 16028476992.

The previous prime is 20210021059. The next prime is 20210021131. The reversal of 20210021105 is 50112001202.

It is a cyclic number.

It is not a de Polignac number, because 20210021105 - 2¹⁶ = 20209955569 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20210021105.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 238952 + ... + 312278.

It is an arithmetic number, because the mean of its divisors is an integer number (1528888800).

Almost surely, 2^20210021105 is an apocalyptic number.

It is an amenable number.

20210021105 is a deficient number, since it is larger than the sum of its proper divisors (4252199695).

20210021105 is a wasteful number, since it uses less digits than its factorization.

20210021105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73808.

The product of its (nonzero) digits is 40, while the sum is 14.

Adding to 20210021105 its reverse (50112001202), we get a palindrome (70322022307).

The spelling of 20210021105 in words is "twenty billion, two hundred ten million, twenty-one thousand, one hundred five".