20011212021 has 8 divisors (see below), whose sum is σ = 26682370624. Its totient is φ = 13340430720.

The previous prime is 20011211953. The next prime is 20011212059. The reversal of 20011212021 is 12021211002.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20011212021 - 2⁹ = 20011211509 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20011211988 and 20011212006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20011212061) 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, 70656 + ... + 212166.

It is an arithmetic number, because the mean of its divisors is an integer number (3335296328).

Almost surely, 2^20011212021 is an apocalyptic number.

It is an amenable number.

20011212021 is a deficient number, since it is larger than the sum of its proper divisors (6671158603).

20011212021 is a wasteful number, since it uses less digits than its factorization.

20011212021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188651.

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

Adding to 20011212021 its reverse (12021211002), we get a palindrome (32032423023).

The spelling of 20011212021 in words is "twenty billion, eleven million, two hundred twelve thousand, twenty-one".