15220121025 has 24 divisors (see below), whose sum is σ = 25283220064. Its totient is φ = 8078918400.

The previous prime is 15220121023. The next prime is 15220121047. The reversal of 15220121025 is 52012102251.

It is not a de Polignac number, because 15220121025 - 2¹ = 15220121023 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 15220120992 and 15220121010.

It is not an unprimeable number, because it can be changed into a prime (15220121023) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 465064 + ... + 496713.

Almost surely, 2^15220121025 is an apocalyptic number.

15220121025 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

15220121025 is a deficient number, since it is larger than the sum of its proper divisors (10063099039).

15220121025 is a wasteful number, since it uses less digits than its factorization.

15220121025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 962001 (or 961996 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 21.

Adding to 15220121025 its reverse (52012102251), we get a palindrome (67232223276).

The spelling of 15220121025 in words is "fifteen billion, two hundred twenty million, one hundred twenty-one thousand, twenty-five".