912002020021 has 4 divisors (see below), whose sum is σ = 917273708172. Its totient is φ = 906730331872.

The previous prime is 912002019961. The next prime is 912002020037. The reversal of 912002020021 is 120020200219.

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

It can be written as a sum of positive squares in 2 ways, for example, as 533148228900 + 378853791121 = 730170^2 + 615511^2 .

It is a cyclic number.

It is not a de Polignac number, because 912002020021 - 2¹³ = 912002011829 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 (912002026021) 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, 2635843816 + ... + 2635844161.

It is an arithmetic number, because the mean of its divisors is an integer number (229318427043).

Almost surely, 2^912002020021 is an apocalyptic number.

It is an amenable number.

912002020021 is a deficient number, since it is larger than the sum of its proper divisors (5271688151).

912002020021 is a wasteful number, since it uses less digits than its factorization.

912002020021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5271688150.

The product of its (nonzero) digits is 144, while the sum is 19.

The spelling of 912002020021 in words is "nine hundred twelve billion, two million, twenty thousand, twenty-one".