20153211621 has 8 divisors (see below), whose sum is σ = 27249413184. Its totient is φ = 13246242240.

The previous prime is 20153211613. The next prime is 20153211653. The reversal of 20153211621 is 12611235102.

It is a happy number.

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

It is not a de Polignac number, because 20153211621 - 2³ = 20153211613 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20153211591 and 20153211600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20153211671) 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, 47307796 + ... + 47308221.

It is an arithmetic number, because the mean of its divisors is an integer number (3406176648).

Almost surely, 2^20153211621 is an apocalyptic number.

It is an amenable number.

20153211621 is a deficient number, since it is larger than the sum of its proper divisors (7096201563).

20153211621 is an equidigital number, since it uses as much as digits as its factorization.

20153211621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94616091.

The product of its (nonzero) digits is 720, while the sum is 24.

Adding to 20153211621 its reverse (12611235102), we get a palindrome (32764446723).

The spelling of 20153211621 in words is "twenty billion, one hundred fifty-three million, two hundred eleven thousand, six hundred twenty-one".