21002581901042 has 8 divisors (see below), whose sum is σ = 36004426116096. Its totient is φ = 9001106529012.

The previous prime is 21002581901029. The next prime is 21002581901051. The reversal of 21002581901042 is 24010918520012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×21002581901042² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21002581900993 and 21002581901011.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 750092210738 + ... + 750092210765.

It is an arithmetic number, because the mean of its divisors is an integer number (4500553264512).

Almost surely, 2^{21002581901042} is an apocalyptic number.

21002581901042 is a deficient number, since it is larger than the sum of its proper divisors (15001844215054).

21002581901042 is a wasteful number, since it uses less digits than its factorization.

21002581901042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1500184421512.

The product of its (nonzero) digits is 11520, while the sum is 35.

The spelling of 21002581901042 in words is "twenty-one trillion, two billion, five hundred eighty-one million, nine hundred one thousand, forty-two".