21756752141 has 4 divisors (see below), whose sum is σ = 21890229312. Its totient is φ = 21623274972.

The previous prime is 21756752119. The next prime is 21756752177. The reversal of 21756752141 is 14125765712.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21756752141 - 2²² = 21752557837 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21756712141) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66738341 + ... + 66738666.

It is an arithmetic number, because the mean of its divisors is an integer number (5472557328).

Almost surely, 2^21756752141 is an apocalyptic number.

It is an amenable number.

21756752141 is a deficient number, since it is larger than the sum of its proper divisors (133477171).

21756752141 is a wasteful number, since it uses less digits than its factorization.

21756752141 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133477170.

The product of its digits is 117600, while the sum is 41.

The spelling of 21756752141 in words is "twenty-one billion, seven hundred fifty-six million, seven hundred fifty-two thousand, one hundred forty-one".