20421143307 has 32 divisors (see below), whose sum is σ = 30860064000. Its totient is φ = 13342570560.

The previous prime is 20421143273. The next prime is 20421143321. The reversal of 20421143307 is 70334112402.

It is a happy number.

20421143307 is a `hidden beast` number, since 204 + 21 + 1 + 433 + 0 + 7 = 666.

It is not a de Polignac number, because 20421143307 - 2⁶ = 20421143243 is a prime.

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

It is not an unprimeable number, because it can be changed into a prime (20421143707) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 507919 + ... + 546647.

It is an arithmetic number, because the mean of its divisors is an integer number (964377000).

Almost surely, 2^20421143307 is an apocalyptic number.

20421143307 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

20421143307 is a deficient number, since it is larger than the sum of its proper divisors (10438920693).

20421143307 is a wasteful number, since it uses less digits than its factorization.

20421143307 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39128 (or 39122 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 27.

Adding to 20421143307 its reverse (70334112402), we get a palindrome (90755255709).

The spelling of 20421143307 in words is "twenty billion, four hundred twenty-one million, one hundred forty-three thousand, three hundred seven".