222106621 has 16 divisors (see below), whose sum is σ = 254923200. Its totient is φ = 191632000.

The previous prime is 222106603. The next prime is 222106657. The reversal of 222106621 is 126601222.

It is not a de Polignac number, because 222106621 - 2²¹ = 220009469 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 222106592 and 222106601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222106681) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12921 + ... + 24721.

It is an arithmetic number, because the mean of its divisors is an integer number (15932700).

Almost surely, 2^222106621 is an apocalyptic number.

It is an amenable number.

222106621 is a deficient number, since it is larger than the sum of its proper divisors (32816579).

222106621 is a wasteful number, since it uses less digits than its factorization.

222106621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11900.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 222106621 is about 14903.2419627409. The cubic root of 222106621 is about 605.6018153789.

Adding to 222106621 its reverse (126601222), we get a palindrome (348707843).

The spelling of 222106621 in words is "two hundred twenty-two million, one hundred six thousand, six hundred twenty-one".