21121691046 has 64 divisors (see below), whose sum is σ = 44089920000. Its totient is φ = 6737411072.

The previous prime is 21121691029. The next prime is 21121691081. The reversal of 21121691046 is 64019612112.

It is a super-2 number, since 2×21121691046² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21121690998 and 21121691016.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11180470 + ... + 11182358.

It is an arithmetic number, because the mean of its divisors is an integer number (688905000).

Almost surely, 2^21121691046 is an apocalyptic number.

21121691046 is an abundant number, since it is smaller than the sum of its proper divisors (22968228954).

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

21121691046 is a wasteful number, since it uses less digits than its factorization.

21121691046 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2461.

The product of its (nonzero) digits is 5184, while the sum is 33.

The spelling of 21121691046 in words is "twenty-one billion, one hundred twenty-one million, six hundred ninety-one thousand, forty-six".