21661465732430 has 16 divisors (see below), whose sum is σ = 38990714159664. Its totient is φ = 8664569439360.

The previous prime is 21661465732429. The next prime is 21661465732433. The reversal of 21661465732430 is 3423756416612.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21661465732433) 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, 4186694 + ... + 7800726.

It is an arithmetic number, because the mean of its divisors is an integer number (2436919634979).

Almost surely, 2^{21661465732430} is an apocalyptic number.

21661465732430 is a deficient number, since it is larger than the sum of its proper divisors (17329248427234).

21661465732430 is a wasteful number, since it uses less digits than its factorization.

21661465732430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4213411.

The product of its (nonzero) digits is 4354560, while the sum is 50.

The spelling of 21661465732430 in words is "twenty-one trillion, six hundred sixty-one billion, four hundred sixty-five million, seven hundred thirty-two thousand, four hundred thirty".