20210021001205 has 16 divisors (see below), whose sum is σ = 27792122319360. Its totient is φ = 13820539070592.

The previous prime is 20210021001167. The next prime is 20210021001227. The reversal of 20210021001205 is 50210012001202.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 20210021001205 - 2⁷ = 20210021001077 is a prime.

It is a super-2 number, since 2×20210021001205² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

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, 786675400 + ... + 786701089.

It is an arithmetic number, because the mean of its divisors is an integer number (1737007644960).

Almost surely, 2^{20210021001205} is an apocalyptic number.

It is an amenable number.

20210021001205 is a deficient number, since it is larger than the sum of its proper divisors (7582101318155).

20210021001205 is a wasteful number, since it uses less digits than its factorization.

20210021001205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1573376868.

The product of its (nonzero) digits is 80, while the sum is 16.

Adding to 20210021001205 its reverse (50210012001202), we get a palindrome (70420033002407).

The spelling of 20210021001205 in words is "twenty trillion, two hundred ten billion, twenty-one million, one thousand, two hundred five".