21012340519 has 8 divisors (see below), whose sum is σ = 21144641760. Its totient is φ = 20880298656.

The previous prime is 21012340511. The next prime is 21012340537. The reversal of 21012340519 is 91504321012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21012340519 - 2³ = 21012340511 is a prime.

It is a super-2 number, since 2×21012340519² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21012340511) 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, 98982 + ... + 227644.

It is an arithmetic number, because the mean of its divisors is an integer number (2643080220).

Almost surely, 2^21012340519 is an apocalyptic number.

21012340519 is a deficient number, since it is larger than the sum of its proper divisors (132301241).

21012340519 is a wasteful number, since it uses less digits than its factorization.

21012340519 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129689.

The product of its (nonzero) digits is 2160, while the sum is 28.

The spelling of 21012340519 in words is "twenty-one billion, twelve million, three hundred forty thousand, five hundred nineteen".