1011721391632 has 80 divisors (see below), whose sum is σ = 2298750584832. Its totient is φ = 422357765760.

The previous prime is 1011721391617. The next prime is 1011721391641. The reversal of 1011721391632 is 2361931271101.

1011721391632 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 1011721391591 and 1011721391600.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 655263 + ... + 1566145.

Almost surely, 2^{1011721391632} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1011721391632, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1149375292416).

1011721391632 is an abundant number, since it is smaller than the sum of its proper divisors (1287029193200).

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

1011721391632 is a wasteful number, since it uses less digits than its factorization.

1011721391632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 911156 (or 911150 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 37.

The spelling of 1011721391632 in words is "one trillion, eleven billion, seven hundred twenty-one million, three hundred ninety-one thousand, six hundred thirty-two".