21629061 has 6 divisors (see below), whose sum is σ = 31241990. Its totient is φ = 14419368.

The previous prime is 21629059. The next prime is 21629063. The reversal of 21629061 is 16092612.

It is an interprime number because it is at equal distance from previous prime (21629059) and next prime (21629063).

It can be written as a sum of positive squares in only one way, i.e., 21622500 + 6561 = 4650^2 + 81^2 .

It is not a de Polignac number, because 21629061 - 2¹ = 21629059 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21629063) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1201606 + ... + 1201623.

Almost surely, 2^21629061 is an apocalyptic number.

It is an amenable number.

21629061 is a deficient number, since it is larger than the sum of its proper divisors (9612929).

21629061 is a wasteful number, since it uses less digits than its factorization.

21629061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2403235 (or 2403232 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 21629061 is about 4650.7054303622. The cubic root of 21629061 is about 278.6201714651.

The spelling of 21629061 in words is "twenty-one million, six hundred twenty-nine thousand, sixty-one".