101221011 has 24 divisors (see below), whose sum is σ = 153673520. Its totient is φ = 64120896.

The previous prime is 101220971. The next prime is 101221019. The reversal of 101221011 is 110122101.

It is a happy number.

It is not a de Polignac number, because 101221011 - 2¹³ = 101212819 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 101220984 and 101221002.

It is not an unprimeable number, because it can be changed into a prime (101221019) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10785 + ... + 17853.

Almost surely, 2^101221011 is an apocalyptic number.

101221011 is a deficient number, since it is larger than the sum of its proper divisors (52452509).

101221011 is a wasteful number, since it uses less digits than its factorization.

101221011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7155 (or 7152 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

The square root of 101221011 is about 10060.8653206372. The cubic root of 101221011 is about 466.0403898876.

Adding to 101221011 its reverse (110122101), we get a palindrome (211343112).

The spelling of 101221011 in words is "one hundred one million, two hundred twenty-one thousand, eleven".