21431122019 has 8 divisors (see below), whose sum is σ = 21845588832. Its totient is φ = 21019783680.

The previous prime is 21431121997. The next prime is 21431122021. The reversal of 21431122019 is 91022113412.

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 21431122019 - 2¹⁶ = 21431056483 is a prime.

It is a super-2 number, since 2×21431122019² (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 (21431122039) 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, 768284 + ... + 795689.

It is an arithmetic number, because the mean of its divisors is an integer number (2730698604).

Almost surely, 2^21431122019 is an apocalyptic number.

21431122019 is a deficient number, since it is larger than the sum of its proper divisors (414466813).

21431122019 is a wasteful number, since it uses less digits than its factorization.

21431122019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1564237.

The product of its (nonzero) digits is 864, while the sum is 26.

The spelling of 21431122019 in words is "twenty-one billion, four hundred thirty-one million, one hundred twenty-two thousand, nineteen".