1201021210021 has 4 divisors (see below), whose sum is σ = 1201031830944. Its totient is φ = 1201010589100.

The previous prime is 1201021209953. The next prime is 1201021210043. The reversal of 1201021210021 is 1200121201021.

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 1201021210021 - 2¹⁵ = 1201021177253 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1201021209983 and 1201021210010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1201021217021) 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, 5138995 + ... + 5367616.

It is an arithmetic number, because the mean of its divisors is an integer number (300257957736).

Almost surely, 2^{1201021210021} is an apocalyptic number.

It is an amenable number.

1201021210021 is a deficient number, since it is larger than the sum of its proper divisors (10620923).

1201021210021 is a wasteful number, since it uses less digits than its factorization.

1201021210021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10620922.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 1201021210021 its reverse (1200121201021), we get a palindrome (2401142411042).

The spelling of 1201021210021 in words is "one trillion, two hundred one billion, twenty-one million, two hundred ten thousand, twenty-one".