1201023213021 has 16 divisors (see below), whose sum is σ = 1836690219520. Its totient is φ = 774853685280.

The previous prime is 1201023212993. The next prime is 1201023213023. The reversal of 1201023213021 is 1203123201021.

1201023213021 is a `hidden beast` number, since 120 + 10 + 232 + 1 + 302 + 1 = 666.

It is not a de Polignac number, because 1201023213021 - 2⁵ = 1201023212989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1201023212985 and 1201023213003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1201023213023) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 717456280 + ... + 717457953.

It is an arithmetic number, because the mean of its divisors is an integer number (114793138720).

Almost surely, 2^{1201023213021} is an apocalyptic number.

It is an amenable number.

1201023213021 is a deficient number, since it is larger than the sum of its proper divisors (635667006499).

1201023213021 is a wasteful number, since it uses less digits than its factorization.

1201023213021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1434914273 (or 1434914267 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 1201023213021 its reverse (1203123201021), we get a palindrome (2404146414042).

The spelling of 1201023213021 in words is "one trillion, two hundred one billion, twenty-three million, two hundred thirteen thousand, twenty-one".