21525746046 has 64 divisors (see below), whose sum is σ = 51425280000. Its totient is φ = 5873145696.

The previous prime is 21525746041. The next prime is 21525746051. The reversal of 21525746046 is 64064752512.

It is an interprime number because it is at equal distance from previous prime (21525746041) and next prime (21525746051).

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21525745989 and 21525746007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21525746041) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 579955 + ... + 615953.

It is an arithmetic number, because the mean of its divisors is an integer number (803520000).

Almost surely, 2^21525746046 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21525746046, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25712640000).

21525746046 is an abundant number, since it is smaller than the sum of its proper divisors (29899533954).

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

21525746046 is a wasteful number, since it uses less digits than its factorization.

21525746046 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36653.

The product of its (nonzero) digits is 403200, while the sum is 42.

The spelling of 21525746046 in words is "twenty-one billion, five hundred twenty-five million, seven hundred forty-six thousand, forty-six".