21682268501 has 2 divisors, whose sum is σ = 21682268502. Its totient is φ = 21682268500.

The previous prime is 21682268453. The next prime is 21682268507. The reversal of 21682268501 is 10586228612.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13973604100 + 7708664401 = 118210^2 + 87799^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21682268501 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21682268507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10841134250 + 10841134251.

It is an arithmetic number, because the mean of its divisors is an integer number (10841134251).

Almost surely, 2^21682268501 is an apocalyptic number.

It is an amenable number.

21682268501 is a deficient number, since it is larger than the sum of its proper divisors (1).

21682268501 is an equidigital number, since it uses as much as digits as its factorization.

21682268501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 92160, while the sum is 41.

The spelling of 21682268501 in words is "twenty-one billion, six hundred eighty-two million, two hundred sixty-eight thousand, five hundred one".