21768460747607 has 4 divisors (see below), whose sum is σ = 24878240854416. Its totient is φ = 18658680640800.

The previous prime is 21768460747601. The next prime is 21768460747613. The reversal of 21768460747607 is 70674706486712.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (21768460747601) and next prime (21768460747613).

It is a cyclic number.

It is not a de Polignac number, because 21768460747607 - 2⁴ = 21768460747591 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21768460747601) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1554890053394 + ... + 1554890053407.

It is an arithmetic number, because the mean of its divisors is an integer number (6219560213604).

Almost surely, 2^{21768460747607} is an apocalyptic number.

21768460747607 is a deficient number, since it is larger than the sum of its proper divisors (3109780106809).

21768460747607 is an equidigital number, since it uses as much as digits as its factorization.

21768460747607 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3109780106808.

The product of its (nonzero) digits is 132765696, while the sum is 65.

The spelling of 21768460747607 in words is "twenty-one trillion, seven hundred sixty-eight billion, four hundred sixty million, seven hundred forty-seven thousand, six hundred seven".