21470621525345 has 16 divisors (see below), whose sum is σ = 27402652408320. Its totient is φ = 16093621227264.

The previous prime is 21470621525341. The next prime is 21470621525357. The reversal of 21470621525345 is 54352512607412.

It is a cyclic number.

It is not a de Polignac number, because 21470621525345 - 2² = 21470621525341 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21470621525345.

It is not an unprimeable number, because it can be changed into a prime (21470621525341) 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 15 ways as a sum of consecutive naturals, for example, 566338775 + ... + 566376684.

It is an arithmetic number, because the mean of its divisors is an integer number (1712665775520).

Almost surely, 2^{21470621525345} is an apocalyptic number.

It is an amenable number.

21470621525345 is a deficient number, since it is larger than the sum of its proper divisors (5932030882975).

21470621525345 is a wasteful number, since it uses less digits than its factorization.

21470621525345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1132715704.

The product of its (nonzero) digits is 2016000, while the sum is 47.

The spelling of 21470621525345 in words is "twenty-one trillion, four hundred seventy billion, six hundred twenty-one million, five hundred twenty-five thousand, three hundred forty-five".