21715510252612 has 48 divisors (see below), whose sum is σ = 43896375048960. Its totient is φ = 9289877619200.

The previous prime is 21715510252559. The next prime is 21715510252619. The reversal of 21715510252612 is 21625201551712.

It is not an unprimeable number, because it can be changed into a prime (21715510252619) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42674037 + ... + 43179907.

It is an arithmetic number, because the mean of its divisors is an integer number (914507813520).

Almost surely, 2^{21715510252612} is an apocalyptic number.

21715510252612 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21715510252612 is an abundant number, since it is smaller than the sum of its proper divisors (22180864796348).

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

21715510252612 is a wasteful number, since it uses less digits than its factorization.

21715510252612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 563292 (or 563290 counting only the distinct ones).

The product of its (nonzero) digits is 84000, while the sum is 40.

The spelling of 21715510252612 in words is "twenty-one trillion, seven hundred fifteen billion, five hundred ten million, two hundred fifty-two thousand, six hundred twelve".