21003000677 has 2 divisors, whose sum is σ = 21003000678. Its totient is φ = 21003000676.

The previous prime is 21003000671. The next prime is 21003000713. The reversal of 21003000677 is 77600030012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17148950116 + 3854050561 = 130954^2 + 62081^2 .

It is a cyclic number.

It is not a de Polignac number, because 21003000677 - 2⁴ = 21003000661 is a prime.

It is a super-2 number, since 2×21003000677² (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 (21003000671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10501500338 + 10501500339.

It is an arithmetic number, because the mean of its divisors is an integer number (10501500339).

Almost surely, 2^21003000677 is an apocalyptic number.

It is an amenable number.

21003000677 is a deficient number, since it is larger than the sum of its proper divisors (1).

21003000677 is an equidigital number, since it uses as much as digits as its factorization.

21003000677 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1764, while the sum is 26.

Adding to 21003000677 its reverse (77600030012), we get a palindrome (98603030689).

The spelling of 21003000677 in words is "twenty-one billion, three million, six hundred seventy-seven", and thus it is an aban number.