21020452005400 has 96 divisors (see below), whose sum is σ = 50672983284000. Its totient is φ = 8099749969920.

The previous prime is 21020452005373. The next prime is 21020452005431. The reversal of 21020452005400 is 450025402012.

It is a super-2 number, since 2×21020452005400² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1581609 + ... + 6674008.

It is an arithmetic number, because the mean of its divisors is an integer number (527843575875).

Almost surely, 2^{21020452005400} is an apocalyptic number.

21020452005400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21020452005400 is an abundant number, since it is smaller than the sum of its proper divisors (29652531278600).

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

21020452005400 is a wasteful number, since it uses less digits than its factorization.

21020452005400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8256101 (or 8256092 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 25.

Adding to 21020452005400 its reverse (450025402012), we get a palindrome (21470477407412).

The spelling of 21020452005400 in words is "twenty-one trillion, twenty billion, four hundred fifty-two million, five thousand, four hundred".