21201031425 has 96 divisors (see below), whose sum is σ = 42692124672. Its totient is φ = 9073025280.

The previous prime is 21201031403. The next prime is 21201031427. The reversal of 21201031425 is 52413010212.

It is not a de Polignac number, because 21201031425 - 2⁸ = 21201031169 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (21201031427) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 548847 + ... + 586203.

It is an arithmetic number, because the mean of its divisors is an integer number (444709632).

Almost surely, 2^21201031425 is an apocalyptic number.

21201031425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21201031425 is an abundant number, since it is smaller than the sum of its proper divisors (21491093247).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21201031425 is a wasteful number, since it uses less digits than its factorization.

21201031425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37447 (or 37442 counting only the distinct ones).

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

Adding to 21201031425 its reverse (52413010212), we get a palindrome (73614041637).

The spelling of 21201031425 in words is "twenty-one billion, two hundred one million, thirty-one thousand, four hundred twenty-five".