213797021 has 8 divisors (see below), whose sum is σ = 218030400. Its totient is φ = 209605248.

The previous prime is 213797011. The next prime is 213797041. The reversal of 213797021 is 120797312.

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 213797021 - 2¹⁸ = 213534877 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213797011) 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, 80 + ... + 20678.

It is an arithmetic number, because the mean of its divisors is an integer number (27253800).

Almost surely, 2^213797021 is an apocalyptic number.

It is an amenable number.

213797021 is a deficient number, since it is larger than the sum of its proper divisors (4233379).

213797021 is a wasteful number, since it uses less digits than its factorization.

213797021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20803.

The product of its (nonzero) digits is 5292, while the sum is 32.

The square root of 213797021 is about 14621.7995130558. The cubic root of 213797021 is about 597.9532304597.

The spelling of 213797021 in words is "two hundred thirteen million, seven hundred ninety-seven thousand, twenty-one".