920213221 has 8 divisors (see below), whose sum is σ = 927864000. Its totient is φ = 912577440.

The previous prime is 920213209. The next prime is 920213237. The reversal of 920213221 is 122312029.

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 920213221 - 2¹⁵ = 920180453 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 920213192 and 920213201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (920213521) 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, 142656 + ... + 148966.

It is an arithmetic number, because the mean of its divisors is an integer number (115983000).

Almost surely, 2^920213221 is an apocalyptic number.

It is an amenable number.

920213221 is a deficient number, since it is larger than the sum of its proper divisors (7650779).

920213221 is a wasteful number, since it uses less digits than its factorization.

920213221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7499.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 920213221 is about 30335.0164166760. The cubic root of 920213221 is about 972.6639567781.

The spelling of 920213221 in words is "nine hundred twenty million, two hundred thirteen thousand, two hundred twenty-one".