20213111230221 has 32 divisors (see below), whose sum is σ = 33170578137088. Its totient is φ = 10661750193600.

The previous prime is 20213111230217. The next prime is 20213111230241. The reversal of 20213111230221 is 12203211131202.

It is not a de Polignac number, because 20213111230221 - 2² = 20213111230217 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20213111230211) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 30501246 + ... + 31156896.

It is an arithmetic number, because the mean of its divisors is an integer number (1036580566784).

Almost surely, 2^{20213111230221} is an apocalyptic number.

20213111230221 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20213111230221 is a deficient number, since it is larger than the sum of its proper divisors (12957466906867).

20213111230221 is a wasteful number, since it uses less digits than its factorization.

20213111230221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 768601.

The product of its (nonzero) digits is 288, while the sum is 21.

Adding to 20213111230221 its reverse (12203211131202), we get a palindrome (32416322361423).

The spelling of 20213111230221 in words is "twenty trillion, two hundred thirteen billion, one hundred eleven million, two hundred thirty thousand, two hundred twenty-one".