21923629 has 24 divisors (see below), whose sum is σ = 27783168. Its totient is φ = 17146080.

The previous prime is 21923621. The next prime is 21923639. The reversal of 21923629 is 92632912.

21923629 = T₄₇₁ + T₄₇₂ + ... + T₆₁₇.

It is not a de Polignac number, because 21923629 - 2³ = 21923621 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21923594 and 21923603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21923621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 80764 + ... + 81034.

It is an arithmetic number, because the mean of its divisors is an integer number (1157632).

Almost surely, 2^21923629 is an apocalyptic number.

It is an amenable number.

21923629 is a deficient number, since it is larger than the sum of its proper divisors (5859539).

21923629 is a wasteful number, since it uses less digits than its factorization.

21923629 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 425 (or 418 counting only the distinct ones).

The product of its digits is 11664, while the sum is 34.

The square root of 21923629 is about 4682.2675062410. The cubic root of 21923629 is about 279.8793229970.

The spelling of 21923629 in words is "twenty-one million, nine hundred twenty-three thousand, six hundred twenty-nine".