20153421234 has 48 divisors (see below), whose sum is σ = 43838340000. Its totient is φ = 6691310208.

The previous prime is 20153421229. The next prime is 20153421241. The reversal of 20153421234 is 43212435102.

20153421234 is a `hidden beast` number, since 2 + 0 + 1 + 5 + 3 + 421 + 234 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 20153421198 and 20153421207.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5758017 + ... + 5761515.

It is an arithmetic number, because the mean of its divisors is an integer number (913298750).

Almost surely, 2^20153421234 is an apocalyptic number.

20153421234 is an abundant number, since it is smaller than the sum of its proper divisors (23684918766).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20153421234 is a wasteful number, since it uses less digits than its factorization.

20153421234 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4679 (or 4676 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

Adding to 20153421234 its reverse (43212435102), we get a palindrome (63365856336).

The spelling of 20153421234 in words is "twenty billion, one hundred fifty-three million, four hundred twenty-one thousand, two hundred thirty-four".