21152629 has 8 divisors (see below), whose sum is σ = 21935160. Its totient is φ = 20373696.

The previous prime is 21152591. The next prime is 21152657. The reversal of 21152629 is 92625112.

It can be written as a sum of positive squares in 4 ways, for example, as 11025 + 21141604 = 105^2 + 4598^2 .

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 21152629 - 2¹³ = 21144437 is a prime.

It is a super-2 number, since 2×21152629² = 894867427223282, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21152597 and 21152606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21152669) 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, 18379 + ... + 19495.

It is an arithmetic number, because the mean of its divisors is an integer number (2741895).

Almost surely, 2^21152629 is an apocalyptic number.

21152629 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

21152629 is a deficient number, since it is larger than the sum of its proper divisors (782531).

21152629 is a wasteful number, since it uses less digits than its factorization.

21152629 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1799.

The product of its digits is 2160, while the sum is 28.

The square root of 21152629 is about 4599.1987345624. The cubic root of 21152629 is about 276.5592045678.

The spelling of 21152629 in words is "twenty-one million, one hundred fifty-two thousand, six hundred twenty-nine".