21411121040 has 20 divisors (see below), whose sum is σ = 49780856604. Its totient is φ = 8564448384.

The previous prime is 21411121031. The next prime is 21411121091. The reversal of 21411121040 is 4012111412.

It can be written as a sum of positive squares in 2 ways, for example, as 15844767376 + 5566353664 = 125876^2 + 74608^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a super-2 number, since 2×21411121040² (a number of 21 digits) contains 22 as substring.

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, 133819427 + ... + 133819586.

Almost surely, 2^21411121040 is an apocalyptic number.

21411121040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21411121040 is an abundant number, since it is smaller than the sum of its proper divisors (28369735564).

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

21411121040 is a wasteful number, since it uses less digits than its factorization.

21411121040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 267639026 (or 267639020 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21411121040 its reverse (4012111412), we get a palindrome (25423232452).

The spelling of 21411121040 in words is "twenty-one billion, four hundred eleven million, one hundred twenty-one thousand, forty".