21519014390 has 32 divisors (see below), whose sum is σ = 39644567424. Its totient is φ = 8406106240.

The previous prime is 21519014381. The next prime is 21519014393. The reversal of 21519014390 is 9341091512.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21519014390.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21519014393) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 167012 + ... + 266328.

It is an arithmetic number, because the mean of its divisors is an integer number (1238892732).

Almost surely, 2^21519014390 is an apocalyptic number.

21519014390 is a deficient number, since it is larger than the sum of its proper divisors (18125553034).

21519014390 is a wasteful number, since it uses less digits than its factorization.

21519014390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99832.

The product of its (nonzero) digits is 9720, while the sum is 35.

The spelling of 21519014390 in words is "twenty-one billion, five hundred nineteen million, fourteen thousand, three hundred ninety".