21356965047 has 16 divisors (see below), whose sum is σ = 31069359360. Its totient is φ = 12941664000.

The previous prime is 21356964883. The next prime is 21356965051. The reversal of 21356965047 is 74056965312.

It is not a de Polignac number, because 21356965047 - 2¹¹ = 21356962999 is a prime.

It is a super-2 number, since 2×21356965047² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21356964987 and 21356965005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21356965057) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 191047 + ... + 281447.

It is an arithmetic number, because the mean of its divisors is an integer number (1941834960).

Almost surely, 2^21356965047 is an apocalyptic number.

21356965047 is a deficient number, since it is larger than the sum of its proper divisors (9712394313).

21356965047 is a wasteful number, since it uses less digits than its factorization.

21356965047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97574.

The product of its (nonzero) digits is 1360800, while the sum is 48.

The spelling of 21356965047 in words is "twenty-one billion, three hundred fifty-six million, nine hundred sixty-five thousand, forty-seven".