197053421 has 4 divisors (see below), whose sum is σ = 201859644. Its totient is φ = 192247200.

The previous prime is 197053411. The next prime is 197053457. The reversal of 197053421 is 124350791.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 124350791 = 739 ⋅168269.

It can be written as a sum of positive squares in 2 ways, for example, as 6916900 + 190136521 = 2630^2 + 13789^2 .

It is a cyclic number.

It is not a de Polignac number, because 197053421 - 2⁶ = 197053357 is a prime.

It is a super-5 number, since 5×197053421⁵ (a number of 43 digits) contains 55555 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (197053411) 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, 2403050 + ... + 2403131.

It is an arithmetic number, because the mean of its divisors is an integer number (50464911).

Almost surely, 2^197053421 is an apocalyptic number.

It is an amenable number.

197053421 is a deficient number, since it is larger than the sum of its proper divisors (4806223).

197053421 is an equidigital number, since it uses as much as digits as its factorization.

197053421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4806222.

The product of its (nonzero) digits is 7560, while the sum is 32.

The square root of 197053421 is about 14037.5717629510. The cubic root of 197053421 is about 581.9173772565.

The spelling of 197053421 in words is "one hundred ninety-seven million, fifty-three thousand, four hundred twenty-one".