21021095 has 16 divisors (see below), whose sum is σ = 26853120. Its totient is φ = 15742464.

The previous prime is 21021083. The next prime is 21021101. The reversal of 21021095 is 59012012.

It is a cyclic number.

It is not a de Polignac number, because 21021095 - 2¹⁶ = 20955559 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18401 + ... + 19509.

It is an arithmetic number, because the mean of its divisors is an integer number (1678320).

Almost surely, 2^21021095 is an apocalyptic number.

21021095 is a deficient number, since it is larger than the sum of its proper divisors (5832025).

21021095 is a wasteful number, since it uses less digits than its factorization.

21021095 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1354.

The product of its (nonzero) digits is 180, while the sum is 20.

The square root of 21021095 is about 4584.8767704269. The cubic root of 21021095 is about 275.9847668901.

The spelling of 21021095 in words is "twenty-one million, twenty-one thousand, ninety-five".