21355414727642 has 32 divisors (see below), whose sum is σ = 33361457850000. Its totient is φ = 10239906482176.

The previous prime is 21355414727623. The next prime is 21355414727657. The reversal of 21355414727642 is 24672741455312.

It can be written as a sum of positive squares in 8 ways, for example, as 895633211641 + 20459781516001 = 946379^2 + 4523249^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 404669834 + ... + 404722602.

Almost surely, 2^{21355414727642} is an apocalyptic number.

21355414727642 is a deficient number, since it is larger than the sum of its proper divisors (12006043122358).

21355414727642 is a wasteful number, since it uses less digits than its factorization.

21355414727642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99778.

The product of its digits is 11289600, while the sum is 53.

The spelling of 21355414727642 in words is "twenty-one trillion, three hundred fifty-five billion, four hundred fourteen million, seven hundred twenty-seven thousand, six hundred forty-two".