21090632042749 has 16 divisors (see below), whose sum is σ = 21405777462720. Its totient is φ = 20777520637440.

The previous prime is 21090632042741. The next prime is 21090632042869. The reversal of 21090632042749 is 94724023609012.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21090632042749 - 2³ = 21090632042741 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21090632042741) by changing a digit.

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 in 15 ways as a sum of consecutive naturals, for example, 104099982 + ... + 104302384.

It is an arithmetic number, because the mean of its divisors is an integer number (1337861091420).

Almost surely, 2^{21090632042749} is an apocalyptic number.

It is an amenable number.

21090632042749 is a deficient number, since it is larger than the sum of its proper divisors (315145419971).

21090632042749 is a wasteful number, since it uses less digits than its factorization.

21090632042749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207420.

The product of its (nonzero) digits is 1306368, while the sum is 49.

The spelling of 21090632042749 in words is "twenty-one trillion, ninety billion, six hundred thirty-two million, forty-two thousand, seven hundred forty-nine".