21234177437 has 8 divisors (see below), whose sum is σ = 24527178432. Its totient is φ = 18168280000.

The previous prime is 21234177383. The next prime is 21234177443. The reversal of 21234177437 is 73477143212.

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

It is a cyclic number.

It is not a de Polignac number, because 21234177437 - 2³⁴ = 4054308253 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21234177394 and 21234177403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21234177457) 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, 56775689 + ... + 56776062.

It is an arithmetic number, because the mean of its divisors is an integer number (3065897304).

Almost surely, 2^21234177437 is an apocalyptic number.

It is an amenable number.

21234177437 is a deficient number, since it is larger than the sum of its proper divisors (3293000995).

21234177437 is a wasteful number, since it uses less digits than its factorization.

21234177437 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113551779.

The product of its digits is 197568, while the sum is 41.

The spelling of 21234177437 in words is "twenty-one billion, two hundred thirty-four million, one hundred seventy-seven thousand, four hundred thirty-seven".