21121053004 has 6 divisors (see below), whose sum is σ = 36961842764. Its totient is φ = 10560526500.

The previous prime is 21121052993. The next prime is 21121053007. The reversal of 21121053004 is 40035012112.

It is not an unprimeable number, because it can be changed into a prime (21121053007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2640131622 + ... + 2640131629.

Almost surely, 2^21121053004 is an apocalyptic number.

It is an amenable number.

21121053004 is a deficient number, since it is larger than the sum of its proper divisors (15840789760).

21121053004 is a wasteful number, since it uses less digits than its factorization.

21121053004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5280263255 (or 5280263253 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 19.

Adding to 21121053004 its reverse (40035012112), we get a palindrome (61156065116).

The spelling of 21121053004 in words is "twenty-one billion, one hundred twenty-one million, fifty-three thousand, four".