21000201030121 has 4 divisors (see below), whose sum is σ = 21165556943872. Its totient is φ = 20834845116372.

The previous prime is 21000201030047. The next prime is 21000201030181. The reversal of 21000201030121 is 12103010200012.

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 21000201030121 - 2¹³ = 21000201021929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21000201030181) 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, 82677956685 + ... + 82677956938.

It is an arithmetic number, because the mean of its divisors is an integer number (5291389235968).

Almost surely, 2^{21000201030121} is an apocalyptic number.

It is an amenable number.

21000201030121 is a deficient number, since it is larger than the sum of its proper divisors (165355913751).

21000201030121 is a wasteful number, since it uses less digits than its factorization.

21000201030121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165355913750.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 21000201030121 its reverse (12103010200012), we get a palindrome (33103211230133).

The spelling of 21000201030121 in words is "twenty-one trillion, two hundred one million, thirty thousand, one hundred twenty-one".