121640025 has 24 divisors (see below), whose sum is σ = 216583360. Its totient is φ = 59883840.

The previous prime is 121640017. The next prime is 121640047. The reversal of 121640025 is 520046121.

It is not a de Polignac number, because 121640025 - 2³ = 121640017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121639983 and 121640010.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 61405 + ... + 63354.

Almost surely, 2^121640025 is an apocalyptic number.

121640025 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

121640025 is a deficient number, since it is larger than the sum of its proper divisors (94943335).

121640025 is a wasteful number, since it uses less digits than its factorization.

121640025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124785 (or 124780 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 121640025 is about 11029.0536765400. The cubic root of 121640025 is about 495.4792827503.

Adding to 121640025 its reverse (520046121), we get a palindrome (641686146).

It can be divided in two parts, 121 and 640025, that added together give a triangular number (640146 = T₁₁₃₁).

The spelling of 121640025 in words is "one hundred twenty-one million, six hundred forty thousand, twenty-five".