21260413999 has 8 divisors (see below), whose sum is σ = 23198221440. Its totient is φ = 19323447000.

The previous prime is 21260413981. The next prime is 21260414009. The reversal of 21260413999 is 99931406212.

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

It is not a de Polignac number, because 21260413999 - 2⁷ = 21260413871 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21260413919) 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, 156619 + ... + 258940.

It is an arithmetic number, because the mean of its divisors is an integer number (2899777680).

Almost surely, 2^21260413999 is an apocalyptic number.

21260413999 is a deficient number, since it is larger than the sum of its proper divisors (1937807441).

21260413999 is a wasteful number, since it uses less digits than its factorization.

21260413999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 420221.

The product of its (nonzero) digits is 209952, while the sum is 46.

The spelling of 21260413999 in words is "twenty-one billion, two hundred sixty million, four hundred thirteen thousand, nine hundred ninety-nine".