21003350625 has 100 divisors (see below), whose sum is σ = 40269900132. Its totient is φ = 10898064000.

The previous prime is 21003350579. The next prime is 21003350629. The reversal of 21003350625 is 52605330012.

21003350625 is a `hidden beast` number, since 2 + 1 + 0 + 0 + 3 + 35 + 0 + 625 = 666.

It can be written as a sum of positive squares in 10 ways, for example, as 17244679761 + 3758670864 = 131319^2 + 61308^2 .

It is not a de Polignac number, because 21003350625 - 2⁶ = 21003350561 is a prime.

It is a super-2 number, since 2×21003350625² (a number of 21 digits) contains 22 as substring.

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

It is not an unprimeable number, because it can be changed into a prime (21003350629) by changing a digit.

It is a polite number, since it can be written in 99 ways as a sum of consecutive naturals, for example, 1867519 + ... + 1878731.

Almost surely, 2^21003350625 is an apocalyptic number.

21003350625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21003350625 is a deficient number, since it is larger than the sum of its proper divisors (19266549507).

21003350625 is an equidigital number, since it uses as much as digits as its factorization.

21003350625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11282 (or 11258 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 27.

Adding to 21003350625 its reverse (52605330012), we get a palindrome (73608680637).

The spelling of 21003350625 in words is "twenty-one billion, three million, three hundred fifty thousand, six hundred twenty-five".