21121000415016 has 64 divisors (see below), whose sum is σ = 53048089987200. Its totient is φ = 7007662457088.

The previous prime is 21121000414957. The next prime is 21121000415087. The reversal of 21121000415016 is 61051400012112.

It is a super-2 number, since 2×21121000415016² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

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, 2238925 + ... + 6874211.

It is an arithmetic number, because the mean of its divisors is an integer number (828876406050).

Almost surely, 2^{21121000415016} is an apocalyptic number.

It is an amenable number.

21121000415016 is an abundant number, since it is smaller than the sum of its proper divisors (31927089572184).

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

21121000415016 is a wasteful number, since it uses less digits than its factorization.

21121000415016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4636178 (or 4636174 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 24.

Adding to 21121000415016 its reverse (61051400012112), we get a palindrome (82172400427128).

The spelling of 21121000415016 in words is "twenty-one trillion, one hundred twenty-one billion, four hundred fifteen thousand, sixteen".