21307526742621 has 32 divisors (see below), whose sum is σ = 32725265448960. Its totient is φ = 12079490423616.

The previous prime is 21307526742617. The next prime is 21307526742637. The reversal of 21307526742621 is 12624762570312.

It is not a de Polignac number, because 21307526742621 - 2² = 21307526742617 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21307526742521) 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 31 ways as a sum of consecutive naturals, for example, 104516575 + ... + 104720243.

It is an arithmetic number, because the mean of its divisors is an integer number (1022664545280).

Almost surely, 2^{21307526742621} is an apocalyptic number.

21307526742621 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21307526742621 is a deficient number, since it is larger than the sum of its proper divisors (11417738706339).

21307526742621 is a wasteful number, since it uses less digits than its factorization.

21307526742621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243033.

The product of its (nonzero) digits is 1693440, while the sum is 48.

The spelling of 21307526742621 in words is "twenty-one trillion, three hundred seven billion, five hundred twenty-six million, seven hundred forty-two thousand, six hundred twenty-one".