21111503057 has 8 divisors (see below), whose sum is σ = 22358205792. Its totient is φ = 19865339200.

The previous prime is 21111503033. The next prime is 21111503081. The reversal of 21111503057 is 75030511112.

It is an interprime number because it is at equal distance from previous prime (21111503033) and next prime (21111503081).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21111503057 - 2⁸ = 21111502801 is a prime.

It is a super-2 number, since 2×21111503057² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21111503857) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 52619 + ... + 212112.

It is an arithmetic number, because the mean of its divisors is an integer number (2794775724).

Almost surely, 2^21111503057 is an apocalyptic number.

It is an amenable number.

21111503057 is a deficient number, since it is larger than the sum of its proper divisors (1246702735).

21111503057 is a wasteful number, since it uses less digits than its factorization.

21111503057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 269439.

The product of its (nonzero) digits is 1050, while the sum is 26.

The spelling of 21111503057 in words is "twenty-one billion, one hundred eleven million, five hundred three thousand, fifty-seven".