6570220421 has 4 divisors (see below), whose sum is σ = 6571616844. Its totient is φ = 6568824000.

The previous prime is 6570220409. The next prime is 6570220429. The reversal of 6570220421 is 1240220756.

It is a happy number.

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 5055921025 + 1514299396 = 71105^2 + 38914^2 .

It is a cyclic number.

It is not a de Polignac number, because 6570220421 - 2³⁰ = 5496478597 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 (6570220429) 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, 691130 + ... + 700571.

It is an arithmetic number, because the mean of its divisors is an integer number (1642904211).

Almost surely, 2^6570220421 is an apocalyptic number.

It is an amenable number.

6570220421 is a deficient number, since it is larger than the sum of its proper divisors (1396423).

6570220421 is a wasteful number, since it uses less digits than its factorization.

6570220421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1396422.

The product of its (nonzero) digits is 6720, while the sum is 29.

The square root of 6570220421 is about 81056.8961964372. The cubic root of 6570220421 is about 1872.9519963540.

The spelling of 6570220421 in words is "six billion, five hundred seventy million, two hundred twenty thousand, four hundred twenty-one".