21376209970 has 32 divisors (see below), whose sum is σ = 39076239168. Its totient is φ = 8417521728.

The previous prime is 21376209961. The next prime is 21376209973. The reversal of 21376209970 is 7990267312.

It is a self number, because there is not a number n which added to its sum of digits gives 21376209970.

It is not an unprimeable number, because it can be changed into a prime (21376209973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1145152 + ... + 1163668.

It is an arithmetic number, because the mean of its divisors is an integer number (1221132474).

Almost surely, 2^21376209970 is an apocalyptic number.

21376209970 is a deficient number, since it is larger than the sum of its proper divisors (17700029198).

21376209970 is a wasteful number, since it uses less digits than its factorization.

21376209970 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20314.

The product of its (nonzero) digits is 285768, while the sum is 46.

The spelling of 21376209970 in words is "twenty-one billion, three hundred seventy-six million, two hundred nine thousand, nine hundred seventy".