21131547019 has 8 divisors (see below), whose sum is σ = 23068096560. Its totient is φ = 19197580800.

The previous prime is 21131547007. The next prime is 21131547113. The reversal of 21131547019 is 91074513112.

It is a happy number.

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 21131547019 - 2¹⁷ = 21131415947 is a prime.

It is a super-2 number, since 2×21131547019² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21131517019) 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, 628702 + ... + 661459.

It is an arithmetic number, because the mean of its divisors is an integer number (2883512070).

Almost surely, 2^21131547019 is an apocalyptic number.

21131547019 is a deficient number, since it is larger than the sum of its proper divisors (1936549541).

21131547019 is a wasteful number, since it uses less digits than its factorization.

21131547019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1291661.

The product of its (nonzero) digits is 7560, while the sum is 34.

The spelling of 21131547019 in words is "twenty-one billion, one hundred thirty-one million, five hundred forty-seven thousand, nineteen".