20021012220001 has 24 divisors (see below), whose sum is σ = 22382727681024. Its totient is φ = 17881714730880.

The previous prime is 20021012219963. The next prime is 20021012220031. The reversal of 20021012220001 is 10002221012002.

It is a happy number.

It is not a de Polignac number, because 20021012220001 - 2¹¹ = 20021012217953 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20021012220031) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 30570360 + ... + 31218406.

It is an arithmetic number, because the mean of its divisors is an integer number (932613653376).

Almost surely, 2^{20021012220001} is an apocalyptic number.

It is an amenable number.

20021012220001 is a deficient number, since it is larger than the sum of its proper divisors (2361715461023).

20021012220001 is a wasteful number, since it uses less digits than its factorization.

20021012220001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 654001 (or 653988 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 20021012220001 its reverse (10002221012002), we get a palindrome (30023233232003).

The spelling of 20021012220001 in words is "twenty trillion, twenty-one billion, twelve million, two hundred twenty thousand, one".