20001220200021 has 8 divisors (see below), whose sum is σ = 26678330604864. Its totient is φ = 13329128297600.

The previous prime is 20001220200011. The next prime is 20001220200037. The reversal of 20001220200021 is 12000202210002.

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

It is a cyclic number.

It is not a de Polignac number, because 20001220200021 - 2³¹ = 19999072716373 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20001220200011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1254616305 + ... + 1254632246.

It is an arithmetic number, because the mean of its divisors is an integer number (3334791325608).

Almost surely, 2^{20001220200021} is an apocalyptic number.

It is an amenable number.

20001220200021 is a deficient number, since it is larger than the sum of its proper divisors (6677110404843).

20001220200021 is a wasteful number, since it uses less digits than its factorization.

20001220200021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2509251211.

The product of its (nonzero) digits is 32, while the sum is 12.

Adding to 20001220200021 its reverse (12000202210002), we get a palindrome (32001422410023).

The spelling of 20001220200021 in words is "twenty trillion, one billion, two hundred twenty million, two hundred thousand, twenty-one".