21534955 has 8 divisors (see below), whose sum is σ = 27829872. Its totient is φ = 15902688.

The previous prime is 21534911. The next prime is 21534967. The reversal of 21534955 is 55943512.

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 21534955 - 2⁷ = 21534827 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21534955.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 165589 + ... + 165718.

It is an arithmetic number, because the mean of its divisors is an integer number (3478734).

Almost surely, 2^21534955 is an apocalyptic number.

21534955 is a deficient number, since it is larger than the sum of its proper divisors (6294917).

21534955 is a wasteful number, since it uses less digits than its factorization.

21534955 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 331325.

The product of its digits is 27000, while the sum is 34.

The square root of 21534955 is about 4640.5770115364. The cubic root of 21534955 is about 278.2155006581.

The spelling of 21534955 in words is "twenty-one million, five hundred thirty-four thousand, nine hundred fifty-five".