20021202091 has 16 divisors (see below), whose sum is σ = 22600988640. Its totient is φ = 17568391680.

The previous prime is 20021202083. The next prime is 20021202133. The reversal of 20021202091 is 19020212002.

It is a cyclic number.

It is not a de Polignac number, because 20021202091 - 2³ = 20021202083 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20021205091) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1478845 + ... + 1492321.

It is an arithmetic number, because the mean of its divisors is an integer number (1412561790).

Almost surely, 2^20021202091 is an apocalyptic number.

20021202091 is a deficient number, since it is larger than the sum of its proper divisors (2579786549).

20021202091 is a wasteful number, since it uses less digits than its factorization.

20021202091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18174.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 20021202091 its reverse (19020212002), we get a palindrome (39041414093).

The spelling of 20021202091 in words is "twenty billion, twenty-one million, two hundred two thousand, ninety-one".