21949728841215 has 32 divisors (see below), whose sum is σ = 44596274472960. Its totient is φ = 10034161755552.

The previous prime is 21949728841171. The next prime is 21949728841259. The reversal of 21949728841215 is 51214882794912.

21949728841215 is a `hidden beast` number, since 2 + 1 + 9 + 497 + 2 + 88 + 41 + 21 + 5 = 666.

It is an interprime number because it is at equal distance from previous prime (21949728841171) and next prime (21949728841259).

It is not a de Polignac number, because 21949728841215 - 2¹² = 21949728837119 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11613612199 + ... + 11613614088.

It is an arithmetic number, because the mean of its divisors is an integer number (1393633577280).

Almost surely, 2^{21949728841215} is an apocalyptic number.

21949728841215 is an abundant number, since it is smaller than the sum of its proper divisors (22646545631745).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21949728841215 is a wasteful number, since it uses less digits than its factorization.

21949728841215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23227226308 (or 23227226302 counting only the distinct ones).

The product of its digits is 23224320, while the sum is 63.

The spelling of 21949728841215 in words is "twenty-one trillion, nine hundred forty-nine billion, seven hundred twenty-eight million, eight hundred forty-one thousand, two hundred fifteen".