21049313930 has 16 divisors (see below), whose sum is σ = 38139686784. Its totient is φ = 8363965200.

The previous prime is 21049313927. The next prime is 21049313933. The reversal of 21049313930 is 3931394012.

It is an interprime number because it is at equal distance from previous prime (21049313927) and next prime (21049313933).

It is not an unprimeable number, because it can be changed into a prime (21049313933) 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, 6968462 + ... + 6971481.

It is an arithmetic number, because the mean of its divisors is an integer number (2383730424).

Almost surely, 2^21049313930 is an apocalyptic number.

21049313930 is a deficient number, since it is larger than the sum of its proper divisors (17090372854).

21049313930 is a wasteful number, since it uses less digits than its factorization.

21049313930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13940101.

The product of its (nonzero) digits is 17496, while the sum is 35.

The spelling of 21049313930 in words is "twenty-one billion, forty-nine million, three hundred thirteen thousand, nine hundred thirty".