20421440152 has 16 divisors (see below), whose sum is σ = 38293327440. Its totient is φ = 10209886176.

The previous prime is 20421440129. The next prime is 20421440153. The reversal of 20421440152 is 25104412402.

It is a super-3 number, since 3×20421440152³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20421440153) 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, 6798 + ... + 202210.

It is an arithmetic number, because the mean of its divisors is an integer number (2393332965).

Almost surely, 2^20421440152 is an apocalyptic number.

It is an amenable number.

20421440152 is a deficient number, since it is larger than the sum of its proper divisors (17871887288).

20421440152 is a wasteful number, since it uses less digits than its factorization.

20421440152 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 208482 (or 208478 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 25.

Adding to 20421440152 its reverse (25104412402), we get a palindrome (45525852554).

The spelling of 20421440152 in words is "twenty billion, four hundred twenty-one million, four hundred forty thousand, one hundred fifty-two".