70012421021 has 4 divisors (see below), whose sum is σ = 70019406492. Its totient is φ = 70005435552.

The previous prime is 70012421009. The next prime is 70012421023. The reversal of 70012421021 is 12012421007.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12012421007 = 151 ⋅79552457.

It can be written as a sum of positive squares in 2 ways, for example, as 33038515225 + 36973905796 = 181765^2 + 192286^2 .

It is a cyclic number.

It is not a de Polignac number, because 70012421021 - 2⁶ = 70012420957 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 70012420984 and 70012421002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (70012421023) 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, 3477680 + ... + 3497753.

It is an arithmetic number, because the mean of its divisors is an integer number (17504851623).

Almost surely, 2^70012421021 is an apocalyptic number.

It is an amenable number.

70012421021 is a deficient number, since it is larger than the sum of its proper divisors (6985471).

70012421021 is a wasteful number, since it uses less digits than its factorization.

70012421021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6985470.

The product of its (nonzero) digits is 224, while the sum is 20.

Adding to 70012421021 its reverse (12012421007), we get a palindrome (82024842028).

The spelling of 70012421021 in words is "seventy billion, twelve million, four hundred twenty-one thousand, twenty-one".