101220121001 has 4 divisors (see below), whose sum is σ = 101220968592. Its totient is φ = 101219273412.

The previous prime is 101220120961. The next prime is 101220121019. The reversal of 101220121001 is 100121022101.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-101220121001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (101220121031) 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, 208055 + ... + 495708.

It is an arithmetic number, because the mean of its divisors is an integer number (25305242148).

Almost surely, 2^101220121001 is an apocalyptic number.

It is an amenable number.

101220121001 is a deficient number, since it is larger than the sum of its proper divisors (847591).

101220121001 is an equidigital number, since it uses as much as digits as its factorization.

101220121001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 847590.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 101220121001 its reverse (100121022101), we get a palindrome (201341143102).

The spelling of 101220121001 in words is "one hundred one billion, two hundred twenty million, one hundred twenty-one thousand, one".