21510007215010 has 32 divisors (see below), whose sum is σ = 38828963178432. Its totient is φ = 8579378606400.

The previous prime is 21510007215001. The next prime is 21510007215031. The reversal of 21510007215010 is 1051270001512.

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, 3540112 + ... + 7453348.

It is an arithmetic number, because the mean of its divisors is an integer number (1213405099326).

Almost surely, 2^{21510007215010} is an apocalyptic number.

21510007215010 is a deficient number, since it is larger than the sum of its proper divisors (17318955963422).

21510007215010 is a wasteful number, since it uses less digits than its factorization.

21510007215010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3914818.

The product of its (nonzero) digits is 700, while the sum is 25.

Adding to 21510007215010 its reverse (1051270001512), we get a palindrome (22561277216522).

The spelling of 21510007215010 in words is "twenty-one trillion, five hundred ten billion, seven million, two hundred fifteen thousand, ten".