21260750057 has 16 divisors (see below), whose sum is σ = 22098590208. Its totient is φ = 20432691840.

The previous prime is 21260750029. The next prime is 21260750059. The reversal of 21260750057 is 75005706212.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21260750057 - 2¹⁴ = 21260733673 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21260749999 and 21260750026.

It is not an unprimeable number, because it can be changed into a prime (21260750059) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6396398 + ... + 6399720.

It is an arithmetic number, because the mean of its divisors is an integer number (1381161888).

Almost surely, 2^21260750057 is an apocalyptic number.

It is an amenable number.

21260750057 is a deficient number, since it is larger than the sum of its proper divisors (837840151).

21260750057 is a wasteful number, since it uses less digits than its factorization.

21260750057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4720.

The product of its (nonzero) digits is 29400, while the sum is 35.

The spelling of 21260750057 in words is "twenty-one billion, two hundred sixty million, seven hundred fifty thousand, fifty-seven".