21612383629 has 4 divisors (see below), whose sum is σ = 21737310876. Its totient is φ = 21487456384.

The previous prime is 21612383627. The next prime is 21612383659. The reversal of 21612383629 is 92638321612.

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

It can be written as a sum of positive squares in 2 ways, for example, as 12348321129 + 9264062500 = 111123^2 + 96250^2 .

It is a cyclic number.

It is not a de Polignac number, because 21612383629 - 2¹ = 21612383627 is a prime.

It is a super-2 number, since 2×21612383629² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21612383621) 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, 62463364 + ... + 62463709.

It is an arithmetic number, because the mean of its divisors is an integer number (5434327719).

Almost surely, 2^21612383629 is an apocalyptic number.

It is an amenable number.

21612383629 is a deficient number, since it is larger than the sum of its proper divisors (124927247).

21612383629 is a wasteful number, since it uses less digits than its factorization.

21612383629 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124927246.

The product of its digits is 186624, while the sum is 43.

The spelling of 21612383629 in words is "twenty-one billion, six hundred twelve million, three hundred eighty-three thousand, six hundred twenty-nine".