21661465732414 has 4 divisors (see below), whose sum is σ = 32492198598624. Its totient is φ = 10830732866206.

The previous prime is 21661465732391. The next prime is 21661465732429. The reversal of 21661465732414 is 41423756416612.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5415366433102 + ... + 5415366433105.

It is an arithmetic number, because the mean of its divisors is an integer number (8123049649656).

Almost surely, 2^{21661465732414} is an apocalyptic number.

21661465732414 is a deficient number, since it is larger than the sum of its proper divisors (10830732866210).

21661465732414 is a wasteful number, since it uses less digits than its factorization.

21661465732414 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10830732866209.

The product of its digits is 5806080, while the sum is 52.

The spelling of 21661465732414 in words is "twenty-one trillion, six hundred sixty-one billion, four hundred sixty-five million, seven hundred thirty-two thousand, four hundred fourteen".