21221414425 has 24 divisors (see below), whose sum is σ = 26474644800. Its totient is φ = 16874172480.

The previous prime is 21221414399. The next prime is 21221414437. The reversal of 21221414425 is 52441412212.

It is not a de Polignac number, because 21221414425 - 2¹⁷ = 21221283353 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21221414393 and 21221414402.

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, 2841346 + ... + 2848804.

It is an arithmetic number, because the mean of its divisors is an integer number (1103110200).

Almost surely, 2^21221414425 is an apocalyptic number.

21221414425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21221414425 is a deficient number, since it is larger than the sum of its proper divisors (5253230375).

21221414425 is a wasteful number, since it uses less digits than its factorization.

21221414425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8145 (or 8140 counting only the distinct ones).

The product of its digits is 5120, while the sum is 28.

Adding to 21221414425 its reverse (52441412212), we get a palindrome (73662826637).

It can be divided in two parts, 21 and 221414425, that added together give a triangular number (221414446 = T₂₁₀₄₃).

The spelling of 21221414425 in words is "twenty-one billion, two hundred twenty-one million, four hundred fourteen thousand, four hundred twenty-five".