21969869309401 has 8 divisors (see below), whose sum is σ = 24236928994824. Its totient is φ = 19785248158080.

The previous prime is 21969869309393. The next prime is 21969869309429. The reversal of 21969869309401 is 10490396896912.

It can be written as a sum of positive squares in 4 ways, for example, as 921409929801 + 21048459379600 = 959901^2 + 4587860^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21969869309401 - 2³ = 21969869309393 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21969869309491) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20609632966 + ... + 20609634031.

It is an arithmetic number, because the mean of its divisors is an integer number (3029616124353).

Almost surely, 2^{21969869309401} is an apocalyptic number.

It is an amenable number.

21969869309401 is a deficient number, since it is larger than the sum of its proper divisors (2267059685423).

21969869309401 is a wasteful number, since it uses less digits than its factorization.

21969869309401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41219267051.

The product of its (nonzero) digits is 45349632, while the sum is 67.

The spelling of 21969869309401 in words is "twenty-one trillion, nine hundred sixty-nine billion, eight hundred sixty-nine million, three hundred nine thousand, four hundred one".