20210421264 has 160 divisors (see below), whose sum is σ = 60884103168. Its totient is φ = 5715072000.

The previous prime is 20210421211. The next prime is 20210421269. The reversal of 20210421264 is 46212401202.

It is a happy number.

It is a super-2 number, since 2×20210421264² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (20210421269) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 477609 + ... + 518199.

Almost surely, 2^20210421264 is an apocalyptic number.

20210421264 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20210421264, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30442051584).

20210421264 is an abundant number, since it is smaller than the sum of its proper divisors (40673681904).

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

20210421264 is a wasteful number, since it uses less digits than its factorization.

20210421264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40677 (or 40671 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 24.

Adding to 20210421264 its reverse (46212401202), we get a palindrome (66422822466).

The spelling of 20210421264 in words is "twenty billion, two hundred ten million, four hundred twenty-one thousand, two hundred sixty-four".