20035221553 has 4 divisors (see below), whose sum is σ = 20035940080. Its totient is φ = 20034503028.

The previous prime is 20035221551. The next prime is 20035221559. The reversal of 20035221553 is 35512253002.

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.

It is a cyclic number.

It is not a de Polignac number, because 20035221553 - 2¹ = 20035221551 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20035221551) 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, 315675 + ... + 373792.

It is an arithmetic number, because the mean of its divisors is an integer number (5008985020).

Almost surely, 2^20035221553 is an apocalyptic number.

It is an amenable number.

20035221553 is a deficient number, since it is larger than the sum of its proper divisors (718527).

20035221553 is an equidigital number, since it uses as much as digits as its factorization.

20035221553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 718526.

The product of its (nonzero) digits is 9000, while the sum is 28.

Adding to 20035221553 its reverse (35512253002), we get a palindrome (55547474555).

The spelling of 20035221553 in words is "twenty billion, thirty-five million, two hundred twenty-one thousand, five hundred fifty-three".