70198421 has 4 divisors (see below), whose sum is σ = 70566144. Its totient is φ = 69830700.

The previous prime is 70198417. The next prime is 70198439. The reversal of 70198421 is 12489107.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12489107 = 3527 ⋅3541.

It is a cyclic number.

It is not a de Polignac number, because 70198421 - 2² = 70198417 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (70198441) 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, 183575 + ... + 183956.

It is an arithmetic number, because the mean of its divisors is an integer number (17641536).

Almost surely, 2^70198421 is an apocalyptic number.

It is an amenable number.

70198421 is a deficient number, since it is larger than the sum of its proper divisors (367723).

70198421 is a wasteful number, since it uses less digits than its factorization.

70198421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 367722.

The product of its (nonzero) digits is 4032, while the sum is 32.

The square root of 70198421 is about 8378.4497969493. The cubic root of 70198421 is about 412.5175671735.

The spelling of 70198421 in words is "seventy million, one hundred ninety-eight thousand, four hundred twenty-one".