20021210000001 has 36 divisors (see below), whose sum is σ = 34726276925184. Its totient is φ = 11071636858800.

The previous prime is 20021209999979. The next prime is 20021210000009. The reversal of 20021210000001 is 10000001212002.

It is not a de Polignac number, because 20021210000001 - 2¹¹ = 20021209997953 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is not an unprimeable number, because it can be changed into a prime (20021210000009) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 732237445 + ... + 732264786.

Almost surely, 2^{20021210000001} is an apocalyptic number.

20021210000001 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20021210000001 is a deficient number, since it is larger than the sum of its proper divisors (14705066925183).

20021210000001 is a wasteful number, since it uses less digits than its factorization.

20021210000001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1464502282 (or 1464502272 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 20021210000001 its reverse (10000001212002), we get a palindrome (30021211212003).

The spelling of 20021210000001 in words is "twenty trillion, twenty-one billion, two hundred ten million, one", and thus it is an aban number.