21203276697 has 6 divisors (see below), whose sum is σ = 30626955242. Its totient is φ = 14135517792.

The previous prime is 21203276683. The next prime is 21203276711. The reversal of 21203276697 is 79667230212.

It is an interprime number because it is at equal distance from previous prime (21203276683) and next prime (21203276711).

It can be written as a sum of positive squares in only one way, i.e., 17751831696 + 3451445001 = 133236^2 + 58749^2 .

It is not a de Polignac number, because 21203276697 - 2⁴ = 21203276681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21203276797) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1177959808 + ... + 1177959825.

Almost surely, 2^21203276697 is an apocalyptic number.

It is an amenable number.

21203276697 is a deficient number, since it is larger than the sum of its proper divisors (9423678545).

21203276697 is a wasteful number, since it uses less digits than its factorization.

21203276697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2355919639 (or 2355919636 counting only the distinct ones).

The product of its (nonzero) digits is 381024, while the sum is 45.

The spelling of 21203276697 in words is "twenty-one billion, two hundred three million, two hundred seventy-six thousand, six hundred ninety-seven".