21405030251330 has 64 divisors (see below), whose sum is σ = 42142615200000. Its totient is φ = 7763126872320.

The previous prime is 21405030251261. The next prime is 21405030251357. The reversal of 21405030251330 is 3315203050412.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21405030251293 and 21405030251302.

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, 85581296 + ... + 85831044.

It is an arithmetic number, because the mean of its divisors is an integer number (658478362500).

Almost surely, 2^{21405030251330} is an apocalyptic number.

21405030251330 is a deficient number, since it is larger than the sum of its proper divisors (20737584948670).

21405030251330 is a wasteful number, since it uses less digits than its factorization.

21405030251330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 251819.

The product of its (nonzero) digits is 10800, while the sum is 29.

The spelling of 21405030251330 in words is "twenty-one trillion, four hundred five billion, thirty million, two hundred fifty-one thousand, three hundred thirty".