10135185021 has 60 divisors (see below), whose sum is σ = 16450566132. Its totient is φ = 6218529408.

The previous prime is 10135185019. The next prime is 10135185059. The reversal of 10135185021 is 12058153101.

10135185021 is a `hidden beast` number, since 10 + 135 + 18 + 502 + 1 = 666.

It can be written as a sum of positive squares in 6 ways, for example, as 9187222500 + 947962521 = 95850^2 + 30789^2 .

It is not a de Polignac number, because 10135185021 - 2¹ = 10135185019 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10135185091) by changing a digit.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 30074565 + ... + 30074901.

Almost surely, 2^10135185021 is an apocalyptic number.

It is an amenable number.

10135185021 is a deficient number, since it is larger than the sum of its proper divisors (6315381111).

10135185021 is an frugal number, since it uses more digits than its factorization.

10135185021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 414 (or 353 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 27.

The spelling of 10135185021 in words is "ten billion, one hundred thirty-five million, one hundred eighty-five thousand, twenty-one".