21490641734 has 16 divisors (see below), whose sum is σ = 32304303360. Its totient is φ = 10722564360.

The previous prime is 21490641701. The next prime is 21490641737. The reversal of 21490641734 is 43714609412.

It is a junction number, because it is equal to n+sod(n) for n = 21490641691 and 21490641700.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21490641737) 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, 2228447 + ... + 2238069.

It is an arithmetic number, because the mean of its divisors is an integer number (2019018960).

Almost surely, 2^21490641734 is an apocalyptic number.

21490641734 is a deficient number, since it is larger than the sum of its proper divisors (10813661626).

21490641734 is a wasteful number, since it uses less digits than its factorization.

21490641734 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11875.

The product of its (nonzero) digits is 145152, while the sum is 41.

The spelling of 21490641734 in words is "twenty-one billion, four hundred ninety million, six hundred forty-one thousand, seven hundred thirty-four".