42021121021 has 8 divisors (see below), whose sum is σ = 45847093824. Its totient is φ = 38196126720.

The previous prime is 42021120991. The next prime is 42021121027. The reversal of 42021121021 is 12012112024.

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

It is a cyclic number.

It is not a de Polignac number, because 42021121021 - 2⁵ = 42021120989 is a prime.

It is a super-2 number, since 2×42021121021² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 42021120986 and 42021121004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42021121027) 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, 153345 + ... + 327958.

It is an arithmetic number, because the mean of its divisors is an integer number (5730886728).

Almost surely, 2^42021121021 is an apocalyptic number.

It is an amenable number.

42021121021 is a deficient number, since it is larger than the sum of its proper divisors (3825972803).

42021121021 is a wasteful number, since it uses less digits than its factorization.

42021121021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 489251.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 42021121021 its reverse (12012112024), we get a palindrome (54033233045).

The spelling of 42021121021 in words is "forty-two billion, twenty-one million, one hundred twenty-one thousand, twenty-one".