21125150421 has 8 divisors (see below), whose sum is σ = 28187006400. Its totient is φ = 14073364032.

The previous prime is 21125150413. The next prime is 21125150429. The reversal of 21125150421 is 12405152112.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21125150413) and next prime (21125150429).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21125150421 - 2³ = 21125150413 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21125150391 and 21125150400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21125150429) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2512500 + ... + 2520893.

It is an arithmetic number, because the mean of its divisors is an integer number (3523375800).

Almost surely, 2^21125150421 is an apocalyptic number.

It is an amenable number.

21125150421 is a deficient number, since it is larger than the sum of its proper divisors (7061855979).

21125150421 is a wasteful number, since it uses less digits than its factorization.

21125150421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5034795.

The product of its (nonzero) digits is 800, while the sum is 24.

The spelling of 21125150421 in words is "twenty-one billion, one hundred twenty-five million, one hundred fifty thousand, four hundred twenty-one".