20010012010021 has 4 divisors (see below), whose sum is σ = 21829104010944. Its totient is φ = 18190920009100.

The previous prime is 20010012009937. The next prime is 20010012010049. The reversal of 20010012010021 is 12001021001002.

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 20010012010021 - 2¹³ = 20010012001829 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 (20010012010081) 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, 909546000445 + ... + 909546000466.

It is an arithmetic number, because the mean of its divisors is an integer number (5457276002736).

Almost surely, 2^{20010012010021} is an apocalyptic number.

It is an amenable number.

20010012010021 is a deficient number, since it is larger than the sum of its proper divisors (1819092000923).

20010012010021 is a wasteful number, since it uses less digits than its factorization.

20010012010021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1819092000922.

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

Adding to 20010012010021 its reverse (12001021001002), we get a palindrome (32011033011023).

The spelling of 20010012010021 in words is "twenty trillion, ten billion, twelve million, ten thousand, twenty-one".