21877433 has 2 divisors, whose sum is σ = 21877434. Its totient is φ = 21877432.

The previous prime is 21877423. The next prime is 21877483. The reversal of 21877433 is 33477812.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21603904 + 273529 = 4648^2 + 523^2 .

It is a cyclic number.

It is not a de Polignac number, because 21877433 - 2⁶ = 21877369 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 21877393 and 21877402.

It is not a weakly prime, because it can be changed into another prime (21877403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10938716 + 10938717.

It is an arithmetic number, because the mean of its divisors is an integer number (10938717).

Almost surely, 2^21877433 is an apocalyptic number.

It is an amenable number.

21877433 is a deficient number, since it is larger than the sum of its proper divisors (1).

21877433 is an equidigital number, since it uses as much as digits as its factorization.

21877433 is an evil number, because the sum of its binary digits is even.

The product of its digits is 28224, while the sum is 35.

The square root of 21877433 is about 4677.3318248762. The cubic root of 21877433 is about 279.6826037843.

The spelling of 21877433 in words is "twenty-one million, eight hundred seventy-seven thousand, four hundred thirty-three".