1210021011001 has 4 divisors (see below), whose sum is σ = 1320022921104. Its totient is φ = 1100019100900.

The previous prime is 1210021010999. The next prime is 1210021011019. The reversal of 1210021011001 is 1001101200121.

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 1210021011001 - 2¹ = 1210021010999 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1210021011701) 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, 55000955035 + ... + 55000955056.

It is an arithmetic number, because the mean of its divisors is an integer number (330005730276).

Almost surely, 2^{1210021011001} is an apocalyptic number.

1210021011001 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1210021011001 is a deficient number, since it is larger than the sum of its proper divisors (110001910103).

1210021011001 is a wasteful number, since it uses less digits than its factorization.

1210021011001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110001910102.

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 1210021011001 its reverse (1001101200121), we get a palindrome (2211122211122).

The spelling of 1210021011001 in words is "one trillion, two hundred ten billion, twenty-one million, eleven thousand, one".