21121302554 has 32 divisors (see below), whose sum is σ = 36623757312. Its totient is φ = 9028800000.

The previous prime is 21121302487. The next prime is 21121302577. The reversal of 21121302554 is 45520312112.

It is a super-2 number, since 2×21121302554² (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 15 ways as a sum of consecutive naturals, for example, 472679 + ... + 515429.

It is an arithmetic number, because the mean of its divisors is an integer number (1144492416).

Almost surely, 2^21121302554 is an apocalyptic number.

21121302554 is a deficient number, since it is larger than the sum of its proper divisors (15502454758).

21121302554 is a wasteful number, since it uses less digits than its factorization.

21121302554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44102.

The product of its (nonzero) digits is 2400, while the sum is 26.

Adding to 21121302554 its reverse (45520312112), we get a palindrome (66641614666).

The spelling of 21121302554 in words is "twenty-one billion, one hundred twenty-one million, three hundred two thousand, five hundred fifty-four".