106621510221 has 12 divisors (see below), whose sum is σ = 159712879872. Its totient is φ = 71081006652.

The previous prime is 106621510213. The next prime is 106621510249. The reversal of 106621510221 is 122015126601.

106621510221 is a `hidden beast` number, since 1 + 0 + 6 + 621 + 5 + 10 + 2 + 21 = 666.

It is not a de Polignac number, because 106621510221 - 2³ = 106621510213 is a prime.

It is a super-2 number, since 2×106621510221² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (106621510321) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 219385581 + ... + 219386066.

It is an arithmetic number, because the mean of its divisors is an integer number (13309406656).

Almost surely, 2^106621510221 is an apocalyptic number.

It is an amenable number.

106621510221 is a deficient number, since it is larger than the sum of its proper divisors (53091369651).

106621510221 is an frugal number, since it uses more digits than its factorization.

106621510221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 438771662 (or 438771650 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

Adding to 106621510221 its reverse (122015126601), we get a palindrome (228636636822).

The spelling of 106621510221 in words is "one hundred six billion, six hundred twenty-one million, five hundred ten thousand, two hundred twenty-one".