21772029 has 16 divisors (see below), whose sum is σ = 29808000. Its totient is φ = 14129856.

The previous prime is 21772001. The next prime is 21772033. The reversal of 21772029 is 92027712.

It is a happy number.

It is not a de Polignac number, because 21772029 - 2¹⁵ = 21739261 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21771987 and 21772005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21772229) 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, 23232 + ... + 24150.

It is an arithmetic number, because the mean of its divisors is an integer number (1863000).

Almost surely, 2^21772029 is an apocalyptic number.

It is an amenable number.

21772029 is a deficient number, since it is larger than the sum of its proper divisors (8035971).

21772029 is a wasteful number, since it uses less digits than its factorization.

21772029 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1124.

The product of its (nonzero) digits is 3528, while the sum is 30.

The square root of 21772029 is about 4666.0506855370. The cubic root of 21772029 is about 279.2327165119.

The spelling of 21772029 in words is "twenty-one million, seven hundred seventy-two thousand, twenty-nine".