20020021012091 has 8 divisors (see below), whose sum is σ = 20262184335360. Its totient is φ = 19778877324648.

The previous prime is 20020021012087. The next prime is 20020021012111. The reversal of 20020021012091 is 19021012002002.

It is a happy number.

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 20020021012091 - 2² = 20020021012087 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20020021012021) 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, 254869451 + ... + 254947988.

It is an arithmetic number, because the mean of its divisors is an integer number (2532773041920).

Almost surely, 2^{20020021012091} is an apocalyptic number.

20020021012091 is a deficient number, since it is larger than the sum of its proper divisors (242163323269).

20020021012091 is a wasteful number, since it uses less digits than its factorization.

20020021012091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 509817913.

The product of its (nonzero) digits is 144, while the sum is 20.

Adding to 20020021012091 its reverse (19021012002002), we get a palindrome (39041033014093).

The spelling of 20020021012091 in words is "twenty trillion, twenty billion, twenty-one million, twelve thousand, ninety-one".