20210001201091 has 4 divisors (see below), whose sum is σ = 21764616678112. Its totient is φ = 18655385724072.

The previous prime is 20210001201077. The next prime is 20210001201113. The reversal of 20210001201091 is 19010210001202.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20210001201091 - 2⁴¹ = 18010977945539 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20210001201011) 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, 777307738491 + ... + 777307738516.

It is an arithmetic number, because the mean of its divisors is an integer number (5441154169528).

Almost surely, 2^{20210001201091} is an apocalyptic number.

20210001201091 is a deficient number, since it is larger than the sum of its proper divisors (1554615477021).

20210001201091 is a wasteful number, since it uses less digits than its factorization.

20210001201091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1554615477020.

The product of its (nonzero) digits is 72, while the sum is 19.

Adding to 20210001201091 its reverse (19010210001202), we get a palindrome (39220211202293).

The spelling of 20210001201091 in words is "twenty trillion, two hundred ten billion, one million, two hundred one thousand, ninety-one".