21655363034352 has 80 divisors (see below), whose sum is σ = 56118940970400. Its totient is φ = 7195785179136.

The previous prime is 21655363034351. The next prime is 21655363034369. The reversal of 21655363034352 is 25343036355612.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21655363034351) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 22540318 + ... + 23481410.

It is an arithmetic number, because the mean of its divisors is an integer number (701486762130).

Almost surely, 2^{21655363034352} is an apocalyptic number.

It is an amenable number.

21655363034352 is an abundant number, since it is smaller than the sum of its proper divisors (34463577936048).

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

21655363034352 is a wasteful number, since it uses less digits than its factorization.

21655363034352 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 942610 (or 942604 counting only the distinct ones).

The product of its (nonzero) digits is 5832000, while the sum is 48.

Adding to 21655363034352 its reverse (25343036355612), we get a palindrome (46998399389964).

The spelling of 21655363034352 in words is "twenty-one trillion, six hundred fifty-five billion, three hundred sixty-three million, thirty-four thousand, three hundred fifty-two".