21132061 has 2 divisors, whose sum is σ = 21132062. Its totient is φ = 21132060.

The previous prime is 21132011. The next prime is 21132077. The reversal of 21132061 is 16023112.

It is an a-pointer prime, because the next prime (21132077) can be obtained adding 21132061 to its sum of digits (16).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21104836 + 27225 = 4594^2 + 165^2 .

It is a cyclic number.

It is not a de Polignac number, because 21132061 - 2²³ = 12743453 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21132011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10566030 + 10566031.

It is an arithmetic number, because the mean of its divisors is an integer number (10566031).

Almost surely, 2^21132061 is an apocalyptic number.

It is an amenable number.

21132061 is a deficient number, since it is larger than the sum of its proper divisors (1).

21132061 is an equidigital number, since it uses as much as digits as its factorization.

21132061 is an evil number, because the sum of its binary digits is even.

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

The square root of 21132061 is about 4596.9621490719. The cubic root of 21132061 is about 276.4695369997.

Adding to 21132061 its reverse (16023112), we get a palindrome (37155173).

The spelling of 21132061 in words is "twenty-one million, one hundred thirty-two thousand, sixty-one".