1217916721952 has 48 divisors (see below), whose sum is σ = 2828709821952. Its totient is φ = 505126748160.

The previous prime is 1217916721951. The next prime is 1217916721991. The reversal of 1217916721952 is 2591276197121.

It is a super-2 number, since 2×1217916721952² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1217916721894 and 1217916721903.

It is not an unprimeable number, because it can be changed into a prime (1217916721951) 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, 87688673 + ... + 87702560.

It is an arithmetic number, because the mean of its divisors is an integer number (58931454624).

Almost surely, 2^{1217916721952} is an apocalyptic number.

It is an amenable number.

1217916721952 is an abundant number, since it is smaller than the sum of its proper divisors (1610793100000).

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

1217916721952 is a wasteful number, since it uses less digits than its factorization.

1217916721952 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 175391281 (or 175391273 counting only the distinct ones).

The product of its digits is 952560, while the sum is 53.

The spelling of 1217916721952 in words is "one trillion, two hundred seventeen billion, nine hundred sixteen million, seven hundred twenty-one thousand, nine hundred fifty-two".