21621403142352 has 120 divisors (see below), whose sum is σ = 67578007098784. Its totient is φ = 6652739412864.

The previous prime is 21621403142327. The next prime is 21621403142357. The reversal of 21621403142352 is 25324130412612.

It is a happy number.

21621403142352 is a `hidden beast` number, since 2 + 1 + 6 + 2 + 1 + 403 + 14 + 235 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21621403142357) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 213836398 + ... + 213937485.

Almost surely, 2^{21621403142352} is an apocalyptic number.

It is an amenable number.

21621403142352 is an abundant number, since it is smaller than the sum of its proper divisors (45956603956432).

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

21621403142352 is a wasteful number, since it uses less digits than its factorization.

21621403142352 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 427773919 (or 427773901 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 36.

Adding to 21621403142352 its reverse (25324130412612), we get a palindrome (46945533554964).

The spelling of 21621403142352 in words is "twenty-one trillion, six hundred twenty-one billion, four hundred three million, one hundred forty-two thousand, three hundred fifty-two".