21616028499 has 8 divisors (see below), whose sum is σ = 31038399952. Its totient is φ = 13302171360.

The previous prime is 21616028443. The next prime is 21616028527. The reversal of 21616028499 is 99482061612.

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

It is not a de Polignac number, because 21616028499 - 2⁹ = 21616027987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21616020499) 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, 277128532 + ... + 277128609.

It is an arithmetic number, because the mean of its divisors is an integer number (3879799994).

Almost surely, 2^21616028499 is an apocalyptic number.

21616028499 is a deficient number, since it is larger than the sum of its proper divisors (9422371453).

21616028499 is a wasteful number, since it uses less digits than its factorization.

21616028499 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 554257157.

The product of its (nonzero) digits is 373248, while the sum is 48.

The spelling of 21616028499 in words is "twenty-one billion, six hundred sixteen million, twenty-eight thousand, four hundred ninety-nine".