21221342640152 has 8 divisors (see below), whose sum is σ = 39790017450300. Its totient is φ = 10610671320072.

The previous prime is 21221342640137. The next prime is 21221342640187. The reversal of 21221342640152 is 25104624312212.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1326333915002 + ... + 1326333915017.

Almost surely, 2^{21221342640152} is an apocalyptic number.

It is an amenable number.

21221342640152 is a deficient number, since it is larger than the sum of its proper divisors (18568674810148).

21221342640152 is a wasteful number, since it uses less digits than its factorization.

21221342640152 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2652667830025 (or 2652667830021 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 35.

Adding to 21221342640152 its reverse (25104624312212), we get a palindrome (46325966952364).

The spelling of 21221342640152 in words is "twenty-one trillion, two hundred twenty-one billion, three hundred forty-two million, six hundred forty thousand, one hundred fifty-two".