20153351421 has 16 divisors (see below), whose sum is σ = 34122076800. Its totient is φ = 11516200704.

The previous prime is 20153351399. The next prime is 20153351431. The reversal of 20153351421 is 12415335102.

20153351421 is a `hidden beast` number, since 201 + 5 + 3 + 35 + 1 + 421 = 666.

It is not a de Polignac number, because 20153351421 - 2⁷ = 20153351293 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20153351431) 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, 53315556 + ... + 53315933.

It is an arithmetic number, because the mean of its divisors is an integer number (2132629800).

Almost surely, 2^20153351421 is an apocalyptic number.

20153351421 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20153351421 is a deficient number, since it is larger than the sum of its proper divisors (13968725379).

20153351421 is a wasteful number, since it uses less digits than its factorization.

20153351421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106631505 (or 106631499 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

Adding to 20153351421 its reverse (12415335102), we get a palindrome (32568686523).

The spelling of 20153351421 in words is "twenty billion, one hundred fifty-three million, three hundred fifty-one thousand, four hundred twenty-one".