101221121100021 has 32 divisors (see below), whose sum is σ = 145380877165440. Its totient is φ = 62273753627904.

The previous prime is 101221121100019. The next prime is 101221121100059. The reversal of 101221121100021 is 120001121122101.

It is a happy number.

It is not a de Polignac number, because 101221121100021 - 2¹ = 101221121100019 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101221121101021) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2936566975 + ... + 2936601443.

It is an arithmetic number, because the mean of its divisors is an integer number (4543152411420).

Almost surely, 2^{101221121100021} is an apocalyptic number.

It is an amenable number.

101221121100021 is a deficient number, since it is larger than the sum of its proper divisors (44159756065419).

101221121100021 is a wasteful number, since it uses less digits than its factorization.

101221121100021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51845.

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

Adding to 101221121100021 its reverse (120001121122101), we get a palindrome (221222242222122).

The spelling of 101221121100021 in words is "one hundred one trillion, two hundred twenty-one billion, one hundred twenty-one million, one hundred thousand, twenty-one".