21025401486 has 16 divisors (see below), whose sum is σ = 42067836624. Its totient is φ = 7005628224.

The previous prime is 21025401479. The next prime is 21025401487. The reversal of 21025401486 is 68410452012.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21025401487) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 693661 + ... + 723336.

It is an arithmetic number, because the mean of its divisors is an integer number (2629239789).

Almost surely, 2^21025401486 is an apocalyptic number.

21025401486 is an abundant number, since it is smaller than the sum of its proper divisors (21042435138).

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

21025401486 is a wasteful number, since it uses less digits than its factorization.

21025401486 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1419475.

The product of its (nonzero) digits is 15360, while the sum is 33.

Adding to 21025401486 its reverse (68410452012), we get a palindrome (89435853498).

The spelling of 21025401486 in words is "twenty-one billion, twenty-five million, four hundred one thousand, four hundred eighty-six".