20001210012121 has 8 divisors (see below), whose sum is σ = 21540364940864. Its totient is φ = 18462140842320.

The previous prime is 20001210012059. The next prime is 20001210012209. The reversal of 20001210012121 is 12121001210002.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20001210012121 - 2¹⁵ = 20001209979353 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20001270012121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20954931 + ... + 21888616.

It is an arithmetic number, because the mean of its divisors is an integer number (2692545617608).

Almost surely, 2^{20001210012121} is an apocalyptic number.

It is an amenable number.

20001210012121 is a deficient number, since it is larger than the sum of its proper divisors (1539154928743).

20001210012121 is a wasteful number, since it uses less digits than its factorization.

20001210012121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42879471.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 20001210012121 its reverse (12121001210002), we get a palindrome (32122211222123).

The spelling of 20001210012121 in words is "twenty trillion, one billion, two hundred ten million, twelve thousand, one hundred twenty-one".