21379861045 has 16 divisors (see below), whose sum is σ = 27177353280. Its totient is φ = 16090457344.

The previous prime is 21379860949. The next prime is 21379861051. The reversal of 21379861045 is 54016897312.

It is a cyclic number.

It is not a de Polignac number, because 21379861045 - 2¹⁹ = 21379336757 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21379860986 and 21379861004.

It is a congruent number.

It is an unprimeable number.

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, 134586 + ... + 246724.

It is an arithmetic number, because the mean of its divisors is an integer number (1698584580).

It is a 1-persistent number, because it is pandigital, but 2⋅21379861045 = 42759722090 is not.

Almost surely, 2^21379861045 is an apocalyptic number.

It is an amenable number.

21379861045 is a deficient number, since it is larger than the sum of its proper divisors (5797492235).

21379861045 is a wasteful number, since it uses less digits than its factorization.

21379861045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114404.

The product of its (nonzero) digits is 362880, while the sum is 46.

The spelling of 21379861045 in words is "twenty-one billion, three hundred seventy-nine million, eight hundred sixty-one thousand, forty-five".