21932077 has 2 divisors, whose sum is σ = 21932078. Its totient is φ = 21932076.

The previous prime is 21932063. The next prime is 21932143. The reversal of 21932077 is 77023912.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10982596 + 10949481 = 3314^2 + 3309^2 .

It is a cyclic number.

It is not a de Polignac number, because 21932077 - 2¹⁵ = 21899309 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21936077) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10966038 + 10966039.

It is an arithmetic number, because the mean of its divisors is an integer number (10966039).

Almost surely, 2^21932077 is an apocalyptic number.

It is an amenable number.

21932077 is a deficient number, since it is larger than the sum of its proper divisors (1).

21932077 is an equidigital number, since it uses as much as digits as its factorization.

21932077 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5292, while the sum is 31.

The square root of 21932077 is about 4683.1695463649. The cubic root of 21932077 is about 279.9152677287.

Adding to 21932077 its reverse (77023912), we get a palindrome (98955989).

The spelling of 21932077 in words is "twenty-one million, nine hundred thirty-two thousand, seventy-seven".