21661032235296 has 96 divisors (see below), whose sum is σ = 57428025677568. Its totient is φ = 7148252518400.

The previous prime is 21661032235291. The next prime is 21661032235303. The reversal of 21661032235296 is 69253223016612.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is not an unprimeable number, because it can be changed into a prime (21661032235291) 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, 123177385 + ... + 123353111.

It is an arithmetic number, because the mean of its divisors is an integer number (598208600808).

Almost surely, 2^{21661032235296} 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 21661032235296, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28714012838784).

21661032235296 is an abundant number, since it is smaller than the sum of its proper divisors (35766993442272).

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

21661032235296 is a wasteful number, since it uses less digits than its factorization.

21661032235296 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188554 (or 188546 counting only the distinct ones).

The product of its (nonzero) digits is 1399680, while the sum is 48.

The spelling of 21661032235296 in words is "twenty-one trillion, six hundred sixty-one billion, thirty-two million, two hundred thirty-five thousand, two hundred ninety-six".