21121410004 has 6 divisors (see below), whose sum is σ = 36962467514. Its totient is φ = 10560705000.

The previous prime is 21121409987. The next prime is 21121410019. The reversal of 21121410004 is 40001412112.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 19703736900 + 1417673104 = 140370^2 + 37652^2 .

It is a super-2 number, since 2×21121410004² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21121410004.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2640176247 + ... + 2640176254.

Almost surely, 2^21121410004 is an apocalyptic number.

It is an amenable number.

21121410004 is a deficient number, since it is larger than the sum of its proper divisors (15841057510).

21121410004 is a wasteful number, since it uses less digits than its factorization.

21121410004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5280352505 (or 5280352503 counting only the distinct ones).

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

Adding to 21121410004 its reverse (40001412112), we get a palindrome (61122822116).

The spelling of 21121410004 in words is "twenty-one billion, one hundred twenty-one million, four hundred ten thousand, four".