20012021211 has 16 divisors (see below), whose sum is σ = 32840240384. Its totient is φ = 10555791264.

The previous prime is 20012021203. The next prime is 20012021233. The reversal of 20012021211 is 11212021002.

It is not a de Polignac number, because 20012021211 - 2³ = 20012021203 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20012021261) 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, 36651781 + ... + 36652326.

It is an arithmetic number, because the mean of its divisors is an integer number (2052515024).

Almost surely, 2^20012021211 is an apocalyptic number.

20012021211 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

20012021211 is a deficient number, since it is larger than the sum of its proper divisors (12828219173).

20012021211 is a wasteful number, since it uses less digits than its factorization.

20012021211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73304130.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 20012021211 its reverse (11212021002), we get a palindrome (31224042213).

The spelling of 20012021211 in words is "twenty billion, twelve million, twenty-one thousand, two hundred eleven".