21191048510 has 16 divisors (see below), whose sum is σ = 39374335872. Its totient is φ = 8202986400.

The previous prime is 21191048509. The next prime is 21191048513. The reversal of 21191048510 is 1584019112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21191048513) 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, 34178801 + ... + 34179420.

It is an arithmetic number, because the mean of its divisors is an integer number (2460895992).

Almost surely, 2^21191048510 is an apocalyptic number.

21191048510 is a deficient number, since it is larger than the sum of its proper divisors (18183287362).

21191048510 is a wasteful number, since it uses less digits than its factorization.

21191048510 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68358259.

The product of its (nonzero) digits is 2880, while the sum is 32.

The spelling of 21191048510 in words is "twenty-one billion, one hundred ninety-one million, forty-eight thousand, five hundred ten".