20932013021 has 2 divisors, whose sum is σ = 20932013022. Its totient is φ = 20932013020.

The previous prime is 20932013017. The next prime is 20932013027. The reversal of 20932013021 is 12031023902.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14783884921 + 6148128100 = 121589^2 + 78410^2 .

It is a cyclic number.

It is not a de Polignac number, because 20932013021 - 2² = 20932013017 is a prime.

It is a super-2 number, since 2×20932013021² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20932013027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10466006510 + 10466006511.

It is an arithmetic number, because the mean of its divisors is an integer number (10466006511).

Almost surely, 2^20932013021 is an apocalyptic number.

It is an amenable number.

20932013021 is a deficient number, since it is larger than the sum of its proper divisors (1).

20932013021 is an equidigital number, since it uses as much as digits as its factorization.

20932013021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 23.

Adding to 20932013021 its reverse (12031023902), we get a palindrome (32963036923).

The spelling of 20932013021 in words is "twenty billion, nine hundred thirty-two million, thirteen thousand, twenty-one".