10101011221221 has 4 divisors (see below), whose sum is σ = 13468014961632. Its totient is φ = 6734007480812.

The previous prime is 10101011221219. The next prime is 10101011221247. The reversal of 10101011221221 is 12212211010101.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 10101011221221 - 2¹ = 10101011221219 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 10101011221221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10101016221221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1683501870201 + ... + 1683501870206.

It is an arithmetic number, because the mean of its divisors is an integer number (3367003740408).

Almost surely, 2^{10101011221221} is an apocalyptic number.

It is an amenable number.

10101011221221 is a deficient number, since it is larger than the sum of its proper divisors (3367003740411).

10101011221221 is an equidigital number, since it uses as much as digits as its factorization.

10101011221221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3367003740410.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 10101011221221 its reverse (12212211010101), we get a palindrome (22313222231322).

It can be divided in two parts, 1010101 and 1221221, that multiplied together give a palindrome (1233556553321).

The spelling of 10101011221221 in words is "ten trillion, one hundred one billion, eleven million, two hundred twenty-one thousand, two hundred twenty-one".