21346021052 has 6 divisors (see below), whose sum is σ = 37355536848. Its totient is φ = 10673010524.

The previous prime is 21346021027. The next prime is 21346021087. The reversal of 21346021052 is 25012064312.

It is a happy number.

It is a super-2 number, since 2×21346021052² (a number of 21 digits) contains 22 as substring.

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 as a sum of consecutive naturals, namely, 2668252628 + ... + 2668252635.

It is an arithmetic number, because the mean of its divisors is an integer number (6225922808).

Almost surely, 2^21346021052 is an apocalyptic number.

It is an amenable number.

21346021052 is a deficient number, since it is larger than the sum of its proper divisors (16009515796).

21346021052 is a wasteful number, since it uses less digits than its factorization.

21346021052 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5336505267 (or 5336505265 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 26.

Adding to 21346021052 its reverse (25012064312), we get a palindrome (46358085364).

The spelling of 21346021052 in words is "twenty-one billion, three hundred forty-six million, twenty-one thousand, fifty-two".