20113213021 has 24 divisors (see below), whose sum is σ = 23319092160. Its totient is φ = 17286952320.

The previous prime is 20113212997. The next prime is 20113213037. The reversal of 20113213021 is 12031231102.

It is not a de Polignac number, because 20113213021 - 2⁵ = 20113212989 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20113212986 and 20113213004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20113213051) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1147701 + ... + 1165093.

It is an arithmetic number, because the mean of its divisors is an integer number (971628840).

Almost surely, 2^20113213021 is an apocalyptic number.

It is an amenable number.

20113213021 is a deficient number, since it is larger than the sum of its proper divisors (3205879139).

20113213021 is a wasteful number, since it uses less digits than its factorization.

20113213021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17937 (or 17926 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 20113213021 its reverse (12031231102), we get a palindrome (32144444123).

The spelling of 20113213021 in words is "twenty billion, one hundred thirteen million, two hundred thirteen thousand, twenty-one".