653420211521 has 16 divisors (see below), whose sum is σ = 815487696000. Its totient is φ = 508637402880.

The previous prime is 653420211517. The next prime is 653420211533. The reversal of 653420211521 is 125112024356.

It is a cyclic number.

It is not a de Polignac number, because 653420211521 - 2² = 653420211517 is a prime.

It is a super-2 number, since 2×653420211521² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (653420211421) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4267646 + ... + 4418103.

It is an arithmetic number, because the mean of its divisors is an integer number (50967981000).

Almost surely, 2^653420211521 is an apocalyptic number.

It is an amenable number.

653420211521 is a deficient number, since it is larger than the sum of its proper divisors (162067484479).

653420211521 is a wasteful number, since it uses less digits than its factorization.

653420211521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8686744.

The product of its (nonzero) digits is 14400, while the sum is 32.

Adding to 653420211521 its reverse (125112024356), we get a palindrome (778532235877).

The spelling of 653420211521 in words is "six hundred fifty-three billion, four hundred twenty million, two hundred eleven thousand, five hundred twenty-one".