1212002000021 has 4 divisors (see below), whose sum is σ = 1213669128672. Its totient is φ = 1210334871372.

The previous prime is 1212002000003. The next prime is 1212002000023. The reversal of 1212002000021 is 1200002002121.

It is a happy number.

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 a de Polignac number, because none of the positive numbers 2^k-1212002000021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1212001999966 and 1212002000011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212002000023) 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, 833563235 + ... + 833564688.

It is an arithmetic number, because the mean of its divisors is an integer number (303417282168).

Almost surely, 2^{1212002000021} is an apocalyptic number.

It is an amenable number.

1212002000021 is a deficient number, since it is larger than the sum of its proper divisors (1667128651).

1212002000021 is an equidigital number, since it uses as much as digits as its factorization.

1212002000021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1667128650.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 1212002000021 its reverse (1200002002121), we get a palindrome (2412004002142).

The spelling of 1212002000021 in words is "one trillion, two hundred twelve billion, two million, twenty-one", and thus it is an aban number.