1201000120021 has 16 divisors (see below), whose sum is σ = 1320994934784. Its totient is φ = 1084952882304.

The previous prime is 1201000120013. The next prime is 1201000120039. The reversal of 1201000120021 is 1200210001021.

It is a cyclic number.

It is not a de Polignac number, because 1201000120021 - 2³ = 1201000120013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1201000120091) 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, 9989361 + ... + 10108873.

It is an arithmetic number, because the mean of its divisors is an integer number (82562183424).

Almost surely, 2^{1201000120021} is an apocalyptic number.

It is an amenable number.

1201000120021 is a deficient number, since it is larger than the sum of its proper divisors (119994814763).

1201000120021 is a wasteful number, since it uses less digits than its factorization.

1201000120021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136020.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 1201000120021 its reverse (1200210001021), we get a palindrome (2401210121042).

The spelling of 1201000120021 in words is "one trillion, two hundred one billion, one hundred twenty thousand, twenty-one".