21706378045 has 32 divisors (see below), whose sum is σ = 28633118976. Its totient is φ = 15665894400.

The previous prime is 21706378019. The next prime is 21706378051. The reversal of 21706378045 is 54087360712.

It is not a de Polignac number, because 21706378045 - 2¹¹ = 21706375997 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21706377992 and 21706378010.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11751312 + ... + 11753158.

It is an arithmetic number, because the mean of its divisors is an integer number (894784968).

Almost surely, 2^21706378045 is an apocalyptic number.

It is an amenable number.

21706378045 is a deficient number, since it is larger than the sum of its proper divisors (6926740931).

21706378045 is a wasteful number, since it uses less digits than its factorization.

21706378045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3381.

The product of its (nonzero) digits is 282240, while the sum is 43.

The spelling of 21706378045 in words is "twenty-one billion, seven hundred six million, three hundred seventy-eight thousand, forty-five".