20012011221 has 8 divisors (see below), whose sum is σ = 26692019424. Its totient is φ = 13336671920.

The previous prime is 20012011169. The next prime is 20012011277. The reversal of 20012011221 is 12211021002.

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

It is a cyclic number.

It is not a de Polignac number, because 20012011221 - 2¹⁵ = 20011978453 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20012011197 and 20012011206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20012011291) 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, 1157211 + ... + 1174376.

It is an arithmetic number, because the mean of its divisors is an integer number (3336502428).

Almost surely, 2^20012011221 is an apocalyptic number.

It is an amenable number.

20012011221 is a deficient number, since it is larger than the sum of its proper divisors (6680008203).

20012011221 is a wasteful number, since it uses less digits than its factorization.

20012011221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2334451.

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

Adding to 20012011221 its reverse (12211021002), we get a palindrome (32223032223).

The spelling of 20012011221 in words is "twenty billion, twelve million, eleven thousand, two hundred twenty-one".