21941769 has 16 divisors (see below), whose sum is σ = 30633984. Its totient is φ = 13952400.

The previous prime is 21941767. The next prime is 21941791. The reversal of 21941769 is 96714912.

It is not a de Polignac number, because 21941769 - 2¹ = 21941767 is a prime.

It is a super-2 number, since 2×21941769² = 962882453698722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21941767) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4942 + ... + 8264.

It is an arithmetic number, because the mean of its divisors is an integer number (1914624).

Almost surely, 2^21941769 is an apocalyptic number.

It is an amenable number.

21941769 is a deficient number, since it is larger than the sum of its proper divisors (8692215).

21941769 is a wasteful number, since it uses less digits than its factorization.

21941769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3428.

The product of its digits is 27216, while the sum is 39.

The square root of 21941769 is about 4684.2042013559. The cubic root of 21941769 is about 279.9564940908.

The spelling of 21941769 in words is "twenty-one million, nine hundred forty-one thousand, seven hundred sixty-nine".