21030400045 has 8 divisors (see below), whose sum is σ = 25237504224. Its totient is φ = 16823637264.

The previous prime is 21030400043. The next prime is 21030400063. The reversal of 21030400045 is 54000403012.

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 21030400045 - 2¹ = 21030400043 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21030399995 and 21030400031.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21030400043) 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, 78922 + ... + 219748.

It is an arithmetic number, because the mean of its divisors is an integer number (3154688028).

Almost surely, 2^21030400045 is an apocalyptic number.

It is an amenable number.

21030400045 is a deficient number, since it is larger than the sum of its proper divisors (4207104179).

21030400045 is a wasteful number, since it uses less digits than its factorization.

21030400045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170699.

The product of its (nonzero) digits is 480, while the sum is 19.

Adding to 21030400045 its reverse (54000403012), we get a palindrome (75030803057).

The spelling of 21030400045 in words is "twenty-one billion, thirty million, four hundred thousand, forty-five".