21046503654 has 24 divisors (see below), whose sum is σ = 49746281832. Its totient is φ = 6377728320.

The previous prime is 21046503607. The next prime is 21046503701. The reversal of 21046503654 is 45630564012.

It is an interprime number because it is at equal distance from previous prime (21046503607) and next prime (21046503701).

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 53147539 + ... + 53147934.

It is an arithmetic number, because the mean of its divisors is an integer number (2072761743).

Almost surely, 2^21046503654 is an apocalyptic number.

21046503654 is an abundant number, since it is smaller than the sum of its proper divisors (28699778178).

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

21046503654 is a wasteful number, since it uses less digits than its factorization.

21046503654 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106295492 (or 106295489 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 36.

It can be divided in two parts, 2104650 and 3654, that added together give a square (2108304 = 1452²).

The spelling of 21046503654 in words is "twenty-one billion, forty-six million, five hundred three thousand, six hundred fifty-four".