6564120421 has 8 divisors (see below), whose sum is σ = 6594157440. Its totient is φ = 6534105312.

The previous prime is 6564120403. The next prime is 6564120463. The reversal of 6564120421 is 1240214656.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6564120421 - 2⁹ = 6564119909 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 (6564120401) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1010841 + ... + 1017313.

It is an arithmetic number, because the mean of its divisors is an integer number (824269680).

Almost surely, 2^6564120421 is an apocalyptic number.

It is an amenable number.

6564120421 is a deficient number, since it is larger than the sum of its proper divisors (30037019).

6564120421 is a wasteful number, since it uses less digits than its factorization.

6564120421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10955.

The product of its (nonzero) digits is 11520, while the sum is 31.

The square root of 6564120421 is about 81019.2595683273. The cubic root of 6564120421 is about 1872.3721809622.

The spelling of 6564120421 in words is "six billion, five hundred sixty-four million, one hundred twenty thousand, four hundred twenty-one".