21234166377 has 8 divisors (see below), whose sum is σ = 29002764000. Its totient is φ = 13810839840.

The previous prime is 21234166309. The next prime is 21234166381. The reversal of 21234166377 is 77366143212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21234166377 - 2¹⁶ = 21234100841 is a prime.

It is a super-2 number, since 2×21234166377² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21234162377) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 86317627 + ... + 86317872.

It is an arithmetic number, because the mean of its divisors is an integer number (3625345500).

Almost surely, 2^21234166377 is an apocalyptic number.

It is an amenable number.

21234166377 is a deficient number, since it is larger than the sum of its proper divisors (7768597623).

21234166377 is a wasteful number, since it uses less digits than its factorization.

21234166377 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172635543.

The product of its digits is 254016, while the sum is 42.

The spelling of 21234166377 in words is "twenty-one billion, two hundred thirty-four million, one hundred sixty-six thousand, three hundred seventy-seven".